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Capstone Form and Style
Search strategy description samples: phd search strategy description sample, phd search strategy description sample.
In the example below, notes follow some of the paragraphs.
PhD Dissertation Example (Psychology)
Literature Search Strategy
I searched for relevant literature from the PsycINFO, Business Source Complete, PsycARTICLES, PsycBOOKS, PsycCRITIQUES, PsycEXTRA databases. The search was limited to peer-reviewed scholarly journals using the search terms psychological capital or PsyCap (611 results); mental time travel or thinking perspective (1,086 results); construal-level theory or temporal focus (1,372 results); safety performance or construction safety (8,408 results); and organizational citizenship behaviors or OCB (2,099 results). Next, the search was narrowed to articles published since 2006 using the same search terms across the same databases: psychological capital or PsyCap (553 results); mental time travel or thinking perspective (725 results); construal-level theory or temporal focus (786 results); safety performance or construction safety (2,176 results); and organizational citizenship behaviors (1,706 results).
In the second sentence in the previous paragraph, the student has cleverly incorporated the number of results, which is an important detail, in the list of search terms.
I then added filters by subject and/or classification to the search term groups. Specifically, the classification filters organizational behaviors, personality traits and processes, and industrial and organizational psychology were added to psychological capital or PsyCap (83 results); the classification filters cognitive process, organizational behaviors, personality traits and processes, and industrial and organizational psychology were added to mental time travel or thinking perspective (77 results) and to construallevel theory or temporal focus (116 results). The subject filters construction projects , performance , and job performance were added to the search terms safety performance or construction safety (103 results). Last, the filters subject organizational citizenship behaviors and classification organizational behavior were added to OCBs (128 results).
In the previous paragraph, this thorough, step-by-step overview of the search process is helpful to readers and researchers who might be examining the same topic.
One last search across the same databases targeted peer-reviewed printed material that referred to a combination of the constructs of interest. Specifically, the search term combinations were psychological capital , PsyCap , and safety (24 results); psychological capital and time orientation or time perspective , or thinking perspective, or temporal perspective , or temporal focus, or mental time travel , or construal-level theory (six results); accident , OR safety , OR construction site safety and time orientation , or time perspective , or thinking perspective , or temporal perspective, or temporal focus , or mental time travel , or construal-level theory (155 results); time perspective , or thinking perspective , or temporal perspective , or temporal focus , or mental time travel or construal-level theory and OCBs (nine results).
The inclusion criteria for literature to be included in the review were as follows: (a) organizational-related articles, (b) non-medical-related articles, (c) relevance to the construction industry, and (d) written in English. The references list of selected articles led to seminal works from as far back as 1971 on temporal focus, construal-level theory (CLT), the theory of MindTime, mental time travel, safety performance models, and PsyCap. This research also included six books.
In the previous paragraph, additional information makes this a thorough overview of the search process.
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- How to Write a Literature Review | Guide, Examples, & Templates
How to Write a Literature Review | Guide, Examples, & Templates
Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.
What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .
There are five key steps to writing a literature review:
- Search for relevant literature
- Evaluate sources
- Identify themes, debates, and gaps
- Outline the structure
- Write your literature review
A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.
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Table of contents
What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.
- Quick Run-through
- Step 1 & 2
When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:
- Demonstrate your familiarity with the topic and its scholarly context
- Develop a theoretical framework and methodology for your research
- Position your work in relation to other researchers and theorists
- Show how your research addresses a gap or contributes to a debate
- Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.
Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.
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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.
- Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
- Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
- Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
- Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)
You can also check out our templates with literature review examples and sample outlines at the links below.
Download Word doc Download Google doc
Before you begin searching for literature, you need a clearly defined topic .
If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .
Make a list of keywords
Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.
- Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
- Body image, self-perception, self-esteem, mental health
- Generation Z, teenagers, adolescents, youth
Search for relevant sources
Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:
- Your university’s library catalogue
- Google Scholar
- Project Muse (humanities and social sciences)
- Medline (life sciences and biomedicine)
- EconLit (economics)
- Inspec (physics, engineering and computer science)
You can also use boolean operators to help narrow down your search.
Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.
You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.
For each publication, ask yourself:
- What question or problem is the author addressing?
- What are the key concepts and how are they defined?
- What are the key theories, models, and methods?
- Does the research use established frameworks or take an innovative approach?
- What are the results and conclusions of the study?
- How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
- What are the strengths and weaknesses of the research?
Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.
You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.
Take notes and cite your sources
As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.
It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.
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To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:
- Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
- Themes: what questions or concepts recur across the literature?
- Debates, conflicts and contradictions: where do sources disagree?
- Pivotal publications: are there any influential theories or studies that changed the direction of the field?
- Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?
This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.
- Most research has focused on young women.
- There is an increasing interest in the visual aspects of social media.
- But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.
There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).
Chronological
The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.
Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.
If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.
For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.
Methodological
If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:
- Look at what results have emerged in qualitative versus quantitative research
- Discuss how the topic has been approached by empirical versus theoretical scholarship
- Divide the literature into sociological, historical, and cultural sources
Theoretical
A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.
You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.
Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.
The introduction should clearly establish the focus and purpose of the literature review.
Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.
As you write, you can follow these tips:
- Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
- Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
- Critically evaluate: mention the strengths and weaknesses of your sources
- Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts
In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.
When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !
This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.
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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.
- Sampling methods
- Simple random sampling
- Stratified sampling
- Cluster sampling
- Likert scales
- Reproducibility
Statistics
- Null hypothesis
- Statistical power
- Probability distribution
- Effect size
- Poisson distribution
Research bias
- Optimism bias
- Cognitive bias
- Implicit bias
- Hawthorne effect
- Anchoring bias
- Explicit bias
A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .
It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.
There are several reasons to conduct a literature review at the beginning of a research project:
- To familiarize yourself with the current state of knowledge on your topic
- To ensure that you’re not just repeating what others have already done
- To identify gaps in knowledge and unresolved problems that your research can address
- To develop your theoretical framework and methodology
- To provide an overview of the key findings and debates on the topic
Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.
The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .
A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other academic texts , with an introduction , a main body, and a conclusion .
An annotated bibliography is a list of source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a paper .
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- Study and research support
- Literature searching
Literature searching explained
Develop a search strategy.
A search strategy is an organised structure of key terms used to search a database. The search strategy combines the key concepts of your search question in order to retrieve accurate results.
Your search strategy will account for all:
- possible search terms;
- keywords and phrases;
- truncated and wildcard variations of search terms; and
- subject headings (where applicable).
Each database works differently so you need to adapt your search strategy for each database. You may wish to develop a number of separate search strategies if your research covers several different areas.
It is a good idea to test your strategies and refine them after you have reviewed the search results.
How a search strategy looks in practice
Take a look at this example literature search in PsycINFO (PDF) about self-esteem.
The example shows the subject heading and keyword searches that have been carried out for each concept within our research question and how they have been combined using Boolean operators. It also shows where keyword techniques like truncation, wildcards and adjacency searching have been used.
Search strategy techniques
The next sections show some techniques you can use to develop your search strategy.
Skip straight to:
- Choosing search terms
- Searching with keywords
- Searching for exact phrases
- Using truncated and wildcard searches
Searching with subject headings
- Using Boolean logic
Citation searching
Choose search terms.
Concepts can be expressed in different ways eg “self-esteem” might be referred to as “self-worth”. Your aim is to consider each of your concepts and come up with a list of the different ways they could be expressed.
To find alternative keywords or phrases for your concepts try the following:
- Use a thesaurus to identify synonyms.
- Search for your concepts on a search engine like Google Scholar, scanning the results for alternative words and phrases.
- Examine relevant abstracts or articles for alternative words, phrases and subject headings (if the database uses subject headings).
When you've done this, you should have lists of words and phrases for each concept as in this completed PICO model (PDF) or this example concept map (PDF).
Watch this short video on how to plan a search and generating good search terms:
As you search and scan articles and abstracts, you may discover different key terms to enhance your search strategy.
Using truncation and wildcards can save you time and effort by finding alternative keywords.
Search with keywords
Keywords are free text words and phrases. Database search strategies use a combination of free text and subject headings (where applicable).
A keyword search usually looks for your search terms in the title and abstract of a reference. You may wish to search in title fields only if you want a small number of specific results.
Some databases will find the exact word or phrase, so make sure your spelling is accurate or you will miss references.
Search for the exact phrase
If you want words to appear next to each other in an exact phrase, use quotation marks, eg “self-esteem”.
Phrase searching decreases the number of results you get and makes your results more relevant. Most databases allow you to search for phrases, but check the database guide if you are unsure.
Truncation and wildcard searches
You can use truncated and wildcard searches to find variations of your search term. Truncation is useful for finding singular and plural forms of words and variant endings.
Many databases use an asterisk (*) as their truncation symbol. Check the database help section if you are not sure which symbol to use. For example, “therap*” will find therapy, therapies, therapist or therapists.
A wildcard finds variant spellings of words. Use it to search for a single character, or no character. Check the database help section to see which symbol to use as a wildcard.
Wildcards are useful for finding British and American spellings, for example: “behavio?r” in Medline will find both behaviour and behavior.
There are sometimes different symbols to find a variable single character. For example, in the Medline database, “wom#n” will find woman and also women.
Watch this video to learn more about searching using truncation and wildcards:
Use adjacency searching for more accurate results
You can specify how close two words appear together in your search strategy. This can make your results more relevant; generally the closer two words appear to each other, the closer the relationship is between them.
Commands for adjacency searching differ among databases, so make sure you consult database guides.
In OvidSP databases (like Medline), searching for “physician ADJ3 relationship” will find both physician and relationship within two major words of each other, in any order. This finds more papers than "physician relationship".
Using this adjacency retrieves papers with phrases like "physician patient relationship", "patient physician relationship", "relationship of the physician to the patient" and so on.
Database subject headings are controlled vocabulary terms that a database uses to describe what an article is about.
Watch this video to learn more about using subject headings in database searching:
Using appropriate subject headings enhances your search and will help you to find more results on your topic. This is because subject headings find articles according to their subject, even if the article does not use your chosen key words.
You should combine both subject headings and keywords in your search strategy for each of the concepts you identify. This is particularly important if you are undertaking a systematic review or an in-depth piece of work
Subject headings may vary between databases, so you need to investigate each database separately to find the subject headings they use. For example, for Medline you can use MeSH (Medical Subject Headings) and for Embase you can use the EMTREE thesaurus.
SEARCH TIP: In Ovid databases, search for a known key paper by title, select the "complete reference" button to see which subject headings the database indexers have given that article, and consider adding relevant ones to your own search strategy.
Use Boolean logic to combine search terms
Boolean operators (AND, OR and NOT) allow you to try different combinations of search terms or subject headings.
Databases often show Boolean operators as buttons or drop-down menus that you can click to combine your search terms or results.
The main Boolean operators are:
OR is used to find articles that mention either of the topics you search for.
AND is used to find articles that mention both of the searched topics.
NOT excludes a search term or concept. It should be used with caution as you may inadvertently exclude relevant references.
For example, searching for “self-esteem NOT eating disorders” finds articles that mention self-esteem but removes any articles that mention eating disorders.
Watch this video to learn more about how to combine keywords efficiently to find relevant sources:
Citation searching is a method to find articles that have been cited by other publications.
Use citation searching (or cited reference searching) to:
- find out whether articles have been cited by other authors
- find more recent papers on the same or similar subject
- discover how a known idea or innovation has been confirmed, applied, improved, extended, or corrected
- help make your literature review more comprehensive.
You can use cited reference searching in:
- OvidSP databases
- Google Scholar
- Web of Science
Cited reference searching can complement your literature search. However be careful not to just look at papers that have been cited in isolation. A robust literature search is also needed to limit publication bias.
Watch this video to learn more about citation search:
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Literature searching.
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Further help
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Your dissertation or research project will almost certainly require a search for literature on your topic, whether to identify selected research, to undertake a literature review or inform a full systematic review. Literature searches require planning, careful thought about what it is you wish to find out and a robust strategy to ensure you find relevant material.
On this page:
Planning your search.
- Search techniques and developing your search strategy
Literature reviews
Systematic reviews.
Time spent carefully planning your search can save valuable time later on and lead to more relevant results and a more robust search strategy. You should consider the following:
- Analysing your topic and understanding your research question: Carry out a scoping search to help understand your topic and to help define your question more clearly.
- What are the key concepts in your search?
- What terms might be used to describe those concepts? Consider synonyms and alternative spellings.
- If your question relates to health or clinical medicine, you might like to use PICO (Population, Intervention, Comparison and Outcomes) to analyse your question:
- Combine your concept terms together using the correct operators , such as AND and OR.
See our Library Skills Essentials guide for support materials and guidance for planning your search, including understanding and defining your topic, and defining search terms.
Search techniques and developing a search strategy
Make sure you are confident about using essential search techniques, including combining search terms, phrase searching and truncation. These will help you find relevant results on your topic. See our guide to search techniques:
- Search techniques
When carrying out a literature search to inform a dissertation or extended piece of research, you will need to think carefully about your search strategy. Have a look at our tutorials and videos to help you develop your literature searching skills:
- Search skills for research: tutorials and videos
When you carry out a literature search you may need to search multiple resources (see Sources and Resources ). Your search strategy will need to be adjusted depending on the resource you are using. For some resources, a simple search will be sufficient, whereas for more complex resources with more content, you may need to develop a sophisticated search strategy, ensuring you use the correct search techniques for that resource. See our guides to selected individual resources for further guidance.
- Search guides to individual resources: bibliographic databases
- What is a literature review?
- Why are literature reviews important?
We also provide support for developing advanced search strategies to ensure comprehensive literature retrieval, including searching for systematic reviews. See our guide to Searching for Systematic Reviews.
- Systematic reviews This guide provides information on systematic review processes and support available from UCL Library Services.
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See our library skills training sessions or contact your librarian .
For general enquiries, see Getting Help and contacting us .
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Get help and advice with literature searching
- You can email your librarian direct to ask for advice on your search.
- You can also book a virtual appointment with your librarian for more in depth enquiries.
- Email your librarian to request an appointment or fill out our individual consultation request form .
- Find your librarian
- Find your site library Another way to find your local team.
Literature searching training sessions
- View our full calendar and make a booking
Search Explore
Check out our Explore guide to find out more about how to use Explore for your research.
- Explore guide
- << Previous: FAQs
- Next: Sources and resources >>
- Last Updated: Apr 18, 2024 6:08 PM
- URL: https://library-guides.ucl.ac.uk/dissertations
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Literature Review: Developing a search strategy
- Traditional or narrative literature reviews
- Scoping Reviews
- Systematic literature reviews
- Annotated bibliography
- Keeping up to date with literature
- Finding a thesis
- Evaluating sources and critical appraisal of literature
- Managing and analysing your literature
- Further reading and resources
From research question to search strategy
Keeping a record of your search activity
Good search practice could involve keeping a search diary or document detailing your search activities (Phelps et. al. 2007, pp. 128-149), so that you can keep track of effective search terms, or to help others to reproduce your steps and get the same results.
This record could be a document, table or spreadsheet with:
- The names of the sources you search and which provider you accessed them through - eg Medline (Ovid), Web of Science (Thomson Reuters). You should also include any other literature sources you used.
- how you searched (keyword and/or subject headings)
- which search terms you used (which words and phrases)
- any search techniques you employed (truncation, adjacency, etc)
- how you combined your search terms (AND/OR). Check out the Database Help guide for more tips on Boolean Searching.
- The number of search results from each source and each strategy used. This can be the evidence you need to prove a gap in the literature, and confirms the importance of your research question.
you will be doing a number of searches as your initial search evolves. As your thesis, discussions and argument develops you will search for further evidence and support from the literature. Each search should be included in your search record. |
A search planner may help you to organise you thoughts prior to conducting your search. If you have any problems with organising your thoughts prior, during and after searching please contact your Library Faculty Team for individual help.
- Literature search - a librarian's handout to introduce tools, terms and techniques Created by Elsevier librarian, Katy Kavanagh Web, this document outlines tools, terms and techniques to think about when conducting a literature search.
- Search planner
Literature search cycle
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Diagram text description
This diagram illustrates the literature search cycle. It shows a circle in quarters. Top left quarter is identify main concepts with rectangle describing how to do this by identifying:controlled vocabulary terms, synonyms, keywords and spelling. Top right quarter select library resources to search and rectangle describing resources to search library catalogue relevant journal articles and other resource. Bottom right corner of circle search resources and in rectangle consider using boolean searching proximity searching and truncated searching techniques. Bottom left quarter of circle review and refine results. In rectangle evaluate results, rethink keywords and create alerts.
Have a search framework
Search frameworks are mnemonics which can help you focus your research question. They are also useful in helping you to identify the concepts and terms you will use in your literature search.
PICO is a search framework commonly used in the health sciences to focus clinical questions. As an example, you work in an aged care facility and are interested in whether cranberry juice might help reduce the common occurrence of urinary tract infections. The PICO framework would look like this:
opulation/ atient/ roblem | People living in aged care facilities |
ntervention | Cranberry juice |
omparison | No cranberry juice (status quo) |
utcome | Prevention of UTIs |
Now that the issue has been broken up to its elements, it is easier to turn it into an answerable research question: “Does cranberry juice help reduce urinary tract infections in people living in aged care facilities?”
Other frameworks may be helpful, depending on your question and your field of interest. PICO can be adapted to PICOT (which adds T ime) or PICOS (which adds S tudy design), or PICOC (adding C ontext).
For qualitative questions you could use
- SPIDER : S ample, P henomenon of I nterest, D esign, E valuation, R esearch type
For questions about causes or risk,
- PEO : P opulation, E xposure, O utcomes
For evaluations of interventions or policies,
- SPICE: S etting, P opulation or P erspective, I ntervention, C omparison, E valuation or
- ECLIPSE: E xpectation, C lient group, L ocation, I mpact, P rofessionals, SE rvice
See the University of Notre Dame Australia’s examples of some of these frameworks.
You can also try some PICO examples in the National Library of Medicine's PubMed training site: Using PICO to frame clinical questions.
If you use the elements of your search framework to combine terms, you may find you have narrowed the search too much and will struggle to find relevant studies. Try using only the most critical elements from the mnemonic for concepts to search. For example, in a PICO search, you would sometimes exclude the O (outcome) terms in your search strategy as the outcomes may come from combining the other terms. If the C (comparison) is the status quo, you wouldn't use those terms either. Try to avoid concepts that have vague or broad meanings, such as benefits or health effects. Ask your for help and advice! |
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Writing a Literature Review
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Getting your search right
Keyword searches, widening your search: truncation and wildcards, combining your terms: search operators, being more specific: phrase and proximity searching, subject headings, combining keyword and subject heading searches, using methodological search filters.
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Test your strategy!
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- Search the database for each of the test records and make a note of the unique record number for each one - in Medline this is in the UI field.
- Run your search strategy.
- Run a search for all the record numbers for your test set using 'OR' in between each one.
- Lastly combine the result of your search strategy with the test set using 'OR'.
- If the number of records retrieved stays the same then the strategy has identified all the records. If it doesn't, combine the result of your search strategy with the test set, this time using 'NOT'. This will identify the records in your test set which are not being retrieved. Work out why these weren't retrieved and adjust your search strategy accordingly.
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Think about...
- abbreviations
- related terms
- UK/US spellings
- singular/plural forms of words
- thesaurus terms (where available)
Your search is likely to be complex and involve multiple steps to do with different subjects, what are often called "strands" or "strings" in the search. Look at the appendices of existing reviews for an idea of what's involved in creating a comprehensive search.
Most people should start by finding all the articles on Topic A, then moving on to Topic B, then Topic C (and so on), then combining those strands together using AND (see Combining your terms: search operators below). This will then give you results that mention all those topics.
You will then need to adapt (or "translate") your strategy for each database depending on the searching options available on each one. A core of terms is used across multiple databases - this is the "systematic" part - BUT with additions and subtractions as necessary. While the words in the title and abstract might remain the same, it's highly likely the thesaurus terms (if they exist) will be different across the databases. You may need to leave out some strings completely; for example, let's say you are doing a study that needs to find Randomised Controlled Trials (RCTs) on a particular disease and its treatment. You will be looking in multiple databases for words to do with the condition, and also words that are used for RCTs. But when you are looking in databases that are composed entirely of RCTs (trials registers), the part of a search looking for RCTs doesn’t need to be included as it's redundant.
The techniques described below will help ensure you cover everything. Contact your Subject Librarian if you would like guidance on constructing your search.
This video from the University of Reading gives a good overview of literature searching tips and tricks:
Jump to 01:45 for truncation and 05:46 for wildcards.
- Contact your Subject Librarian
- How to translate searches between certain databases A fantastic crib sheet from Karolinska Institutet University Library, showing how to translate searches between Medline (Ovid), PsycInfo (Ovid), Embase (Elsevier), Web of Science, Cinahl (Ebsco), Cochrane (Wiley), and PubMed.
Most searches have two elements - the "keywords" part and the "subject headings" part - for each topic. When you are initially constructing your search and trialling it in a database, you are likely to just add your keywords, click Search, and see how many that retrieves. But after that, for any type of comprehensive search, you should look at limiting your keywords to looking in specific search fields .
A field in this context is where the database only looks at one aspect of the information about the article. Common examples are the Author, Title, Abstract, and Journal Name. More esoteric ones could be fields like the CAS Registry Entry or Corporate Author.
In complex reviews like systematic, scoping and rapid reviews, the accepted wisdom is to limit these "keyword" searches to the Title and Abstract fields, plus (if available, and the search is looking to be comprehensive) any available "Author Keyword" or "Contributed Indexing" fields. It is vital that the keywords you use in these fields are identical - you are using the same words in the Title, Abstract and any related fields - and that you combine them using OR (see Combining your terms: search operators below)
![literature search strategy dissertation A title, abstract and keyword search in MEDLINE](https://libapps-eu.s3.amazonaws.com/accounts/67452/images/TIAB.png)
Using keyword searching limited to the Title/Abstract/Keywords fields should reduce the number of results which are retrieved in error or are only on the periphery of your subject. If you do this, please be aware that you will need to ensure that you have definitely also included all relevant subject headings in your search strategy (in databases that use controlled vocabulary) otherwise you risk missing out on useful results. It *is* quite possible that there will be no relevant subject headings in a particular search.
Although some databases will automatically search for variant spellings, mostly they will just search for the exact letters you type in. Use wildcard and truncation symbols to take control of your search and include variations to widen your search and ensure you don't miss something relevant.
A truncation symbol (*) retrieves any number of letters - useful to find different word endings based on the root of a word: africa* will find africa, african, africans, africaans agricultur* will find agriculture, agricultural, agriculturalist
A wildcard symbol (?) replaces a single letter . It's useful for retrieving alternate spelling spellings (i.e. British vs American English) and simple plurals: wom?n will find woman or women behavio?r will find behaviour or behavior
Hint: Not all databases use the * and ? symbols - some may use different ones (! instead of *, for example), or not have the feature at all, so check the online help section of the database before you start.
- Introduction
Search operators (also called Boolean operators) allow you to include multiple words and concepts in your searches. This means you can search for all of your terms at once rather than carrying out multiple searches for each concept.
There are three main operators:
- OR - for combining alternative words for your concepts and widening your results e.g. women OR gender
- AND - for combining your concepts giving more specific results e.g. women AND Africa
- NOT - to exclude specific terms from your search - use this with caution as you might exclude relevant results accidentally!
women OR female
Using OR will bring you back records containing either of your search terms. It will return items that include both terms, but will also return items that contain only one of the terms.
This will give you a broader range of results.
OR can be used to link together synonyms. These are then placed in brackets to show that they are all the same concept.
- (cat OR kitten OR feline)
- (women OR female)
women AND Africa
Using AND will find items that contain both of your search terms, giving you a more specific set of results.
If you're getting too many results, using AND can be a good way to narrow your search.
women NOT Africa
Using NOT will find articles containing a particular term, but will exclude articles containing your second term.
Use this with caution - by excluding results you might miss out on key resources.
- Phrase searching
- Proximity searching
Sometimes your search may contain common words (i.e. development, communication) which will retrieve too many irrelevant records, even when using an AND search. On many databases, including Google, to look for a specific phrase, use inverted commas:
- "agricultural development"
- "foot and mouth"
Your search will only bring back items containing these exact phrases.
Some databases automatically perform a phrase search if you do not use any search operators. For example, "agriculture africa" is not a phrase used in English so you may not find any items on the subject. Use AND in between your search words to avoid this.
On Scopus to search for an exact phrase use { } e.g. {agricultural development}. Using quotes on Scopus will find your words in the same field (e.g., title) but not necessarily next to one another. In this database, you need to be very careful with those brackets - {heart-attack} and {heart attack} will return different results because the dash is included. Wildcards are searched as actual characters, e.g. {health care?} returns results such as: Who pays for health care?
Some databases use proximity operators, which are a more advanced search function. You can use these to tell the database how close one word must be to another and, in some cases, in what order. This makes a search more specific and excludes irrelevant records.
For instance, if you were searching for references about women in Africa, you might retrieve irrelevant records for items about women published in Africa. Performing a proximity search will only retrieve the two words in the same sentence, making your search more accurate.
Each database has its own way of proximity searching, often with multiple ways of doing it, so it's important to check the online help before you start . Here are some examples of the variety of possible searches:
- Web of Science : women same Africa - retrieves records where the words 'women' and 'Africa' appear in the same sentence
- JSTOR : agricultural development ~5 - retrieves records where the words 'agricultural' and 'development' are within five words of one another
- Scopus : agricultural W/2 development - retrieves records where the word 'agricultural' is within two words of the word 'development'.
After completing your keywords search on a topic, you can move on to looking for appropriate subject headings.
Most databases have this controlled vocabulary feature (standardised subject headings or thesaurus terms - a bit like standard tags) which can help ensure you capture all the relevant studies; for example, MEDLINE, CENTRAL and PubMed use the exact same headings, which are called MeSH (Medical Subject Headings). Some of these headings will be the same in other related databases like CINAHL, but many of them will be slightly different, could be the same but have subtly different meanings, or not be there at all.
Not all databases have these types of subject headings - Web of Science and JSTOR don't allow you to search for subject headings like these, although you can of course search for subjects in them.
The easiest way to search for a subject heading is to go to the relevant area in the database that searches specifically for them; this might be called something like Thesaurus, Subject Headings, or similar. Then search for some of the words to do with your topic - not all of them at once, just a word on its own or a very simple phrase. Does this bring anything up? When you read the description, are you talking about the same thing?
You can then tell it to search for everything listed under that subject heading, then move on to looking for another subject heading. It's quite common for one topic to have several relevant headings.
Once you have found all the relevant headings, and made the database run searches for them, you will then combine them together using OR.
After you have found all the title/abstract/keywords for Topic A, and then all the relevant subject headings, you then combine those together using OR. You may need to go into the Search History section of the database to do this, and work out whether you can tick boxes next to your various searches to combine them, or have to type out something like "#1 OR #2".
![literature search strategy dissertation How to combine title/abstract/keyword searches with subject searches in Ebsco's MEDLINE](https://libapps-eu.s3.amazonaws.com/accounts/67452/images/TIABSH.png)
This gives you a "super search" with everything in the database on that topic. It's likely to be a lot!
It might be that adding them together gives no extra results than the amount in either the keywords or the subject headings on their own. This is unusual, but not impossible:
![literature search strategy dissertation A combined title, abstract, keywords and subject heading search in MEDLINE](https://libapps-eu.s3.amazonaws.com/accounts/67452/images/TIABSH1.png)
You now go back to the start and for Topic B do the same title/abstract/keywords searches, then the relevant subject headings searches, then combine them as above. Then Topic C, and so on. Again, each of these super searches may have very high numbers - possibly millions.
Finally, you then combine all these super searches together, but this time using AND; they need to mention all the topics. It's possible that there are no articles in that database that mention all those things - the more subjects you AND together, the less results you are likely to find. However, it's also possible to end up with zero as there is a mistake in your search, and in most cases having zero results won't allow you to write your paper or thesis. So contact us if you think you have too few or two many results, and we can advise.
Methodological search filters are search terms or strategies that identify a topic or aspect. They are predefined, tried and tested filters which can be applied to a search.
Study types: 'systematic reviews', 'Randomised Controlled Trials'
Age groups: 'children', 'elderly'
Language: 'English'
They are available to select via the results filters displayed alongside your results and are normally applied at the very end of your search . For instance, on PubMed after running your results it is possible to limit by 'Ages' which gives predefined groupings such as 'Infant: birth-23 months'. These limits and filters are not always the same across the databases, so do be careful .
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Literature Search Basics
Develop a search strategy.
- Define your search
- Decide where to search
What is a search strategy
Advanced search tips.
- Track and save your search
- Class Recording: Writing an Effective Narrative Review
- A search strategy includes a combination of keywords, subject headings, and limiters (language, date, publication type, etc.)
- A search strategy should be planned out and practiced before executing the final search in a database.
- A search strategy and search results should be documented throughout the searching process.
What is a search strategy?
A search strategy is an organized combination of keywords, phrases, subject headings, and limiters used to search a database.
Your search strategy will include:
- keywords
- boolean operators
- variations of search terms (synonyms, suffixes)
- subject headings
Your search strategy may include:
- truncation (where applicable)
- phrases (where applicable)
- limiters (date, language, age, publication type, etc.)
A search strategy usually requires several iterations. You will need to test the strategy along the way to ensure that you are finding relevant articles. It's also a good idea to review your search strategy with your co-authors. They may have ideas about terms or concepts you may have missed.
Additionally, each database you search is developed differently. You will need to adjust your strategy for each database your search. For instance, Embase is a European database, many of the medical terms are slightly different than those used in MEDLINE and PubMed.
Choose search terms
Start by writing down as many terms as you can think of that relate to your question. You might try cited reference searching to find a few good articles that you can review for relevant terms.
Remember than most terms or concepts can be expressed in different ways. A few things to consider:
- synonyms: "cancer" may be referred to as "neoplasms", "tumors", or "malignancy"
- abbreviations: spell out the word instead of abbreviating
- generic vs. trade names of drugs
Search for the exact phrase
If you want words to appear next to each other in an exact phrase, use quotation marks, eg “self-esteem”.
Phrase searching decreases the number of results you get. Most databases allow you to search for phrases, but check the database guide if you are unsure.
Truncation and wildcards
Many databases use an asterisk (*) as their truncation symbol to find various word endings like singulars and plurals. Check the database help section if you are not sure which symbol to use.
"Therap*"
retrieves: therapy, therapies, therapist or therapists.
Use a wildcard (?) to find different spellings like British and American spellings.
"Behavio?r" retrieves behaviour and behavior.
Searching with subject headings
Database subject headings are controlled vocabulary terms that a database uses to describe what an article is about.
Using appropriate subject headings enhances your search and will help you to find more results on your topic. This is because subject headings find articles according to their subject, even if the article does not use your chosen key words.
You should combine both subject headings and keywords in your search strategy for each of the concepts you identify. This is particularly important if you are undertaking a systematic review or an in-depth piece of work
Subject headings may vary between databases, so you need to investigate each database separately to find the subject headings they use. For example, for MEDLINE you can use MeSH (Medical Subject Headings) and for Embase you can use the EMTREE thesaurus.
SEARCH TIP: In Ovid databases, search for a known key paper by title, select the "complete reference" button to see which subject headings the database indexers have given that article, and consider adding relevant ones to your own search strategy.
Use Boolean logic to combine search terms
Boolean operators (AND, OR and NOT) allow you to try different combinations of search terms or subject headings.
Databases often show Boolean operators as buttons or drop-down menus that you can click to combine your search terms or results.
The main Boolean operators are:
OR is used to find articles that mention either of the topics you search for.
AND is used to find articles that mention both of the searched topics.
NOT excludes a search term or concept. It should be used with caution as you may inadvertently exclude relevant references.
For example, searching for “self-esteem NOT eating disorders” finds articles that mention self-esteem but removes any articles that mention eating disorders.
Adjacency searching
Use adjacency operators to search by phrase or with two or more words in relation to one another. A djacency searching commands differ among databases. Check the database help section if you are not sure which searching commands to use.
In Ovid Medline
"breast ADJ3 cancer" finds the word breast within three words of cancer, in any order.
This includes breast cancer or cancer of the breast.
Cited Reference Searching
Cited reference searching is a method to find articles that have been cited by other publications.
Use cited reference searching to:
- find keywords or terms you may need to include in your search strategy
- find pivotal papers the same or similar subject area
- find pivotal authors in the same or similar subject area
- track how a topic has developed over time
Cited reference searching is available through these tools:
- Web of Science
- GoogleScholar
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How to undertake a literature search: a step-by-step guide
Affiliation.
- 1 Literature Search Specialist, Library and Archive Service, Royal College of Nursing, London.
- PMID: 32279549
- DOI: 10.12968/bjon.2020.29.7.431
Undertaking a literature search can be a daunting prospect. Breaking the exercise down into smaller steps will make the process more manageable. This article suggests 10 steps that will help readers complete this task, from identifying key concepts to choosing databases for the search and saving the results and search strategy. It discusses each of the steps in a little more detail, with examples and suggestions on where to get help. This structured approach will help readers obtain a more focused set of results and, ultimately, save time and effort.
Keywords: Databases; Literature review; Literature search; Reference management software; Research questions; Search strategy.
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IMAGES
VIDEO
COMMENTS
PhD Dissertation Example (Psychology) Literature Search Strategy. I searched for relevant literature from the PsycINFO, Business Source Complete, PsycARTICLES, PsycBOOKS, PsycCRITIQUES, PsycEXTRA databases.
Step 1: Develop a research question or choose a topic. Step 2: Brainstorm your search terms, including MeSH terms, that should be included in your search. Step 3: Use Boolean logic to combine your terms.
Step 1 – Search for relevant literature. Step 2 – Evaluate and select sources. Step 3 – Identify themes, debates, and gaps. Step 4 – Outline your literature review’s structure. Step 5 – Write your literature review. Free lecture slides. Other interesting articles. Frequently asked questions. Introduction. Quick Run-through. Step 1 & 2. Step 3.
How to perform a considered and organised literature search. Includes details on how to define your question, choose a database, refine your results, and save and document your search.
When carrying out a literature search to inform a dissertation or extended piece of research, you will need to think carefully about your search strategy. Have a look at our tutorials and videos to help you develop your literature searching skills:
Developing a search strategy is a balance between needing a very precise search that yields fewer highly relevant results or a comprehensive search (high retrieval) with lower precision. The focus of a narrative literature review for a dissertation or thesis is thoroughness, so you should aim for high retrieval.
Literature Review: Developing a search strategy. This guide will define a literature review, describe the process of writing a literature review and examine where to search for literature.
Developing a Search Strategy. Writing a Literature Review. This guide will help you get started on your literature review by providing basic information on what a review is, how to write it and where to do the research. Getting your search right. Before you start you MUST carefully consider what words you need to include in your search.
What is a search strategy. KEY POINTS. A search strategy includes a combination of keywords, subject headings, and limiters (language, date, publication type, etc.) A search strategy should be planned out and practiced before executing the final search in a database.
This article suggests 10 steps that will help readers complete this task, from identifying key concepts to choosing databases for the search and saving the results and search strategy. It discusses each of the steps in a little more detail, with examples and suggestions on where to get help.