The purpose of this page is to give IMPDET-LE students and applicants practical tips for conducting a systematic literature search. The aim of the literature search is to support the literature review task during doctoral studies. There are several purposes for literature review (Creswell, 2009):
- connects the research work to existing knowledge base
- relates the study to the larger ongoing dialogues in the literature
- provides a framework for establishing the importance of the study
- supports the comparison of the results with previous findings
The doctoral student should master the most important literature related to his/her research topic, even better than the supervisor(s). The role of the supervisor is to give a starting point for the literature review, but the task of the student is to go deeper into the literature.
The literature search is usually done in the beginning of the studies, but the literature search might be needed again when writing the articles related to the doctoral studies. Creswell (2009) recommends that the literature search should be started by identifying the key words. It is also good to note that a proper literature search will take time. It is not completed in day or two or even in couple of weeks.
Please use the following questions to guide the beginning of the search:
- why are you doing the search?
- what are you exactly looking for, e.g. what are the key words?
- what sources should be used?
- what is the time span of the literature included in the search?
- how can you limit the search?
- how to identify and select the papers that are most relevant?
- when I have collected "enough" data?
Use variety of sources
One of the most common mistakes of the literature search is that only few sources are used, which makes the results limited. It is extremely important to use variety of different sources. Electronic databases accessible via the University library are a good way of locating research literature, because you can access both recent literature and articles published several years ago. However, search functions in databases might not be very precise. In some cases, better results are achieved, for instance, by using the search functions in the websites of the scientific journals.
The following sources (e.g. mainly various databases) are very useful when conducting the literature search:
- UEF-Finna, https://uef.finna.fi/, UEF-Finna is the search service of library’s printed and electronic resource (databases, online journals, electronic books and dictionaries etc.). In UEF-Finna is is possible also to renew loans, place holds and requests and save your favorites.
- ACM and IEEE Electronic Databases these databases are very relevant for computer science students. Links:ACM database, IEEE database.
- Google Scholar, http://scholar.google.com/; Google scholar provides more academically relevant search results than regular Google search. However, some of the articles found by the Google scholar might not be available for free access. Also do not rely just on the the Google Scholar, but use other sources.
- List of most frequently used databases in UEF; http://www.uef.fi/web/kirjasto/tiedonhaku-ja-tiedonhaun-opetus/pikalinkit
- Science Direct database. Address: http://www.sciencedirect.com/
- List of Journals in Educational Technology and Computer Science Education - These journals are important sources of information for all IMPDET students, for instance, when conducting the literature review or just searching for recent research conducted in educational technology and Computer Science Education.
- Research articles published in the edTech research group. Sometimes you do not need to go far to find the most relevant articles. Make sure that you are aware of the previous research done in your research group. Also it is worthwhile at least to browse through the previous dissertations from the IMPDET-LE study programme; http://cs.joensuu.fi/~context/index.php?page=alumni
Sometimes the literature search demands that you will go manually through some of the key journals related to your research topic. The following process can be used in this case
- Select the journals
- Decide the time period of the search (Five year, 10 years, longer?)
- Systematically go through every single number of the selected journals published within the time period.
- Based on the title, abstract and discussion part of the papers, pick articles for later inspection
- When you do the literature review, you need to go through the articles in detailed.
The latest research and development work in Computer Science can be found in conference articles. Some of the conference series might not be available in the electronic database. In the department library, you can find some conference proceedings (CD-ROMs and books). In some cases, it is worthwhile just to quickly browse through the index of the conference proceedings to find out research articles relevant for your information search task. For instance, via the IEEE/IEE Electronic Library Online you can search directly from the conference proceedings of certain conference series.
Wiki pages can also be helpful in the early stages of the search process. If a Wiki page is created properly it should include references to the origin of the information presented in the Wiki. By following the references you might find more valid sources. It is not encouraged to refer directly to Wiki in the thesis (except when the Wiki is extremely well written and including lot of useful information).
What and how to search?
After the key terms and sources have been decided, the next step is to start thinking about searching strategies. Start the search with general terms and then refine continuously the focus of your search. Avoid random searchers and select carefully which keywords and terms you use in the search. Write down how you have used the search terms, so that the supervisor can give you instructions how to modify the search. Creswell (2009) recommends that the literature search should first locate about 50 reports of research in articles or books related to research on the topic of the doctoral studies.
If you are stuck think about synonyms or change wording. It is important to use terms that are currently being used by the researchers, and not select terms that are outdated. For instance, in educational technology, the term technology-enhanced learning has been used recently to refer to the use of ICT in education or as a synonym to term educational technology.
Often it is also important to find the most important and relevant people in a field or topic. Try to find out those persons who have influenced most to the development of the field (e.g. the name of the person appears in many articles). It is not enough to stop with just a few names, but try to expand to larger amount. It is also beneficial to identify the most relevant research centers, institutions and research groups working with the topic relevant to your information need.
Sometimes it is important to identify articles related to your topi that are mostly cited. Here you can find quick instructions how to do a citation search. http://www.open.ac.uk/library/help-and-support/how-do-i-do-a-citation-search
Also Google Scholar provides citation numbers, but you are not able to rank the hits made by the Google Scholar according to the citation numbers.
How to expand the search results?
As noted earlier a common argument from PhD students is they can't find enough previous research articles related. Thus, it is important to learn how to expand the search results during the literature search process. A very good search strategy is to use the initial search results to find more articles related to the topic. You can expand the search results by searching the references of the articles you retrieved, determine which references are most useful, find the new articles, check their references and keep repeating the process until there are no new relevant articles to be found (Randolph, 2008).
You might also considering searching the other work done by the author(s) of the retrieved research papers. A good hint is also to look for papers published by the research group of the author. Usually the most important persons (e.g. champions) in any field are effective writers and they have most probably published several articles related to the topic of the search.
Summary of the process (Booth, 2004; Creswell, 2009)
- Focus your question/search need
- Decide on the most appropriate sources for the literature
- Perform a systematic search:
- Divide your search into a series of concepts and expressions
- Think of alternative terms (e.g. synonyms) for each concept
- Search each concept separately
- Combine concepts - Boolean logic
- Limit your search in order to limit the search space
- Revise your search, as necessary, and replicate in other sources
- try to visualise the key literature with a visual picture by grouping the literature on the topic, that illustrate how your particular study is positioned in relation to previous reserach
After the search part is completed, the next step is to write a literature review. The purpose of the review is analyse the results of the literature search. The main questions of the literature review are:
- Where: position your research to existing studies and research work. Demonstrate your familiarity with the research field in order to establish credibility
- Why: identify the champions in the research areas. Structure the results of other researchers (summarise, synthesise, critically constrant results from previous studies).
- What: What is this far missing? Do not go into details on other projects, but use references to guide the reader to the appropriate source. What is the area of study? Define the key terms, definitions and terminology.
Practical hints for literature review
- Be systematic, analytical and constructively critical by showing the part to the previous research and how the current work is linked to it
- Draft summaries of the most relevant articles
- Use the existing research to establish a theoretical framework for your topic / subject area
- Let the literature to give a precise overview of previous research conducted related to your research problem
- Use the review to integrate and summarise what is known in a research topic, learn from others and let literature to stimulate new ideas
- Ends the literature review by creating a summary of the main themes and explain how your work contributes to the body of knowledge within the research area of the research topic
Guidelines for performing systematic literature reviews in software engineering
How to do a literature search; The Robert Gordon University
Tips for conducting a literature search
How to do a literature review - PP presentation (this one is from the field of medicine, but can be applied to any field)
How to do a literature search
Guidelines for writing a literature review
Literature review: A few tips on conducting it
Booth, A., Dixon-Woods, M. (2004). How to do a literature search. Course material. University of Leicester).http://www.ccsr.ac.uk/methods/festival2004/programme/Sat/pm
Creswell, J.W. (2009). Research Design - Qualitative, Quantitative and Mixed Methods Approaches. Sage Publications.
Randolph, J. J. (2008). Literature review guide.http://www.cs.joensuu.fi/impdet/uploads/literature_review_guide_Justus_Randolph.pdf