The first question I posed in the title of my blog post is one that all of my students (undergraduate and graduate) and most of my research assistants ask me: how do I know when I’ve read enough for a literature review? The answer is never clear cut, unfortunately. I am someone who loves reading, and who needs to read broadly because his own work is interdisciplinary. I’m also quite systematic in how I read, and I prefer to err on the side of having TOO MANY sources rather than be accused of not knowing the field. I also realize not everyone has the time to be on top of the literature, particularly with teaching, service, family and caring and research obligations. I am going to answer the top six questions I get asked on breadth and depth of literature reviews, and in doing so, I am going to suggest a few shortcuts that may help narrowing a literature review search and finding the “sweet spot” where you’ve read enough that you feel confident enough to start writing your paper, chapter or thesis. 1. How many sources should I read for my literature review? Here’s my totally non-scientific take for coursework-related materials: a final research paper should at least use 13 additional sources to those in the syllabus (one additional paper per week) for an undergraduate class, and an in-depth literature review for a graduate course should be in the realm of 26 (2 additional papers per week) to 39 (3 additional papers per week for PhD students). If somebody writes a final paper for my courses that only use the readings we did during the semester, it shows they didn’t go any further and I’ll probably penalize them. 2. Where do I get sources for my literature review if I am starting up a new topic? Well, here are a couple of strategies:
3. “When should I stop reading and start writing?” My answer to that question is: you should be reading AND writing. Apparently, a lot of people feel like they need to Read All The Things before they can write a literature review. That’s why I always suggest that when you process a reading (a PDF or a printed source), you should generate at the very minimum a row entry in your Excel conceptual synthesis, and a synthetic note (or a rhetorical precis). Obviously, you gain a lot more if you write a full-fledged memo, but you may want to wait to write the memo up until you’ve read a few sources. But you should ALWAYS be writing as you read. You may not assemble the full literature review, but at least you can start with an annotated bibliography. 4. How do I know when to stop reading/researching/seeking more sources? For example, I recently wrote a series of memorandums on the urban commons. I had basically mapped the entire body of works on urban commons using the first 10 citations I found on Google Scholar. However, I wanted to see how much more I could go in depth on the topic. What I found was that there were many case studies, but all using the same conceptual framework. So that’s when I stopped. When I saw that basically every other paper was a variation of the same central 10 ones, but using different case studies. I added those sources to my bibliography, but I didn’t need to incorporate them to my literature review. Another way to respond to this question is: read enough to answer your questions properly. The two biggest questions that probably would encompass the previous ones are related to breadth and depth. 5. How far reaching should your literature review be? Then you have the other associated question – what about the “seminal” (I prefer the word fundamental) articles or books? For me, this is the most challenging component. When I know a field very well (for example, agenda-setting theory in public policy), I can easily decide which authors I will be seeking (Stuart Soroka, Michael Howlett, Baumgartner and Jones, Kingdon). If I am doing policy design, I’ll go with Helen Ingram, Ann Schneider, etc. And then based on doing a citation tracing exercise, I will go to those younger scholars who are citing these key authors. But again, this requires you to know the field already. This is where a supervisor, a coauthor, a colleague or a trusted scholar on Twitter may be helpful with narrowing the search scope. You can ask “who are the key authors I should be reading on Topic A” or “which are the key citations I should be looking at to get a grasp of Field B“. And then use those authors to create a map of the literature. And the last question, which just about everyone asks me: 6. Do I need to do an in-depth reading of All The Things? However, if you are writing a literature review, for example, of agenda-setting theory and its applications to health policy, you may want to read in depth 5-10 articles on health policy, 5-7 articles on agenda-setting theory, and then start writing from there. Again, in-depth reading is correlated with the extent and degree to which you need to demonstrate that you know a field. My method, as most people may have noticed, is usually as follows:
Hopefully this post will help those who are struggling with literature reviews, as the summer approaches! You may also want to revisit my Literature Review posts. |