--- title: "AP Research Literature Review: How to Write It" description: "Learn how to write the AP Research academic paper literature review: synthesize scholarly perspectives, organize by theme, and establish your gap, with rubric tips." canonical: "https://fiveable.me/ap-research/academic-paper/ap-research-paper-lit-review-fiveable/study-guide/Vv4kJfXdFA2ver730oK8" type: "study-guide" subject: "AP Research" unit: "The Academic Paper" lastUpdated: "2026-06-12" --- # AP Research Literature Review: How to Write It ## Summary Learn how to write the AP Research academic paper literature review: synthesize scholarly perspectives, organize by theme, and establish your gap, with rubric tips. ## Guide ## Overview The literature review in the [AP Research](/ap-research "fv-autolink") academic paper synthesizes what scholars already know about your topic and situates your [research question](/ap-research/key-terms/research-question "fv-autolink") inside a gap in that body of knowledge. Together with the introduction, it forms the required "Introduction and Literature Review" element of your 4,000-5,000 word paper, which College Board scores and which counts for 75% of your AP Research score. Here's the mental shift that makes this section click: a literature review is not about your project. It's about everyone else's. You spend most of this section explaining what is already known, how different scholars' [findings](/ap-research/unit-5/effective-presentations/study-guide/MGOHhYx9SK5dnjZvH88b "fv-autolink") agree, conflict, and build on each other, and only at the end do you point at the hole in that conversation and say "that's where my research goes." Coming out of your [introduction](/ap-research/academic-paper/academic-paper-introduction/study-guide/54HJ9xW37BDps5uAJx8L), your reader knows the broad [context](/ap-research/unit-1/developing-research-question/study-guide/pPHJLM74uKpexn59A57t "fv-autolink") of your work. The lit review blows that context up into roughly the first 1,200-1,500 words of your paper (word count varies by discipline and paper format). ## What the Rubric Expects The official task guidelines require that the Introduction and Literature Review "synthesizes the varying [perspectives](/ap-research/key-terms/multiple-perspectives "fv-autolink") in the scholarly literature to situate the research question/project goal within a gap in the current field of knowledge." Two words there do all the heavy lifting: synthesizes and gap. You need scholarly sources with genuinely different perspectives, put in conversation with each other, leading logically to a gap your research will address. The published scoring guidelines for [the academic paper](/ap-research/academic-paper "fv-autolink") score each row from 1 to 5, and the row covering the literature review breaks down roughly like this: ![](https://storage.googleapis.com/ug-images-study-guides/legacy-firebase/images/-qcR5r86q5A6d.png) A lit review earning a 1 or 2 presents a single [perspective](/ap-research/unit-2/reading-sources/study-guide/sPOzge3mYbK28tWaRuTI "fv-autolink"). It doesn't cover a real variety of sources and doesn't describe the body of knowledge around the topic. Papers at the 1 level often lean on non-scholarly works. A news article is not scholarly; a [peer-reviewed](/ap-research/unit-1/evaluating-perspectives/study-guide/bnHwAHDpJWbg7ujTEl4Q "fv-autolink") research paper is, and the peer-reviewed part matters. A 3 has varying perspectives and scholarly works but falls short on connections. The student did solid exploratory research but structured the lit review so the sources never actually talk to each other. This is exactly why the "source spaghetti" approach (more on that below) caps your score. The connections between your sources matter as much as the sources themselves. The 4 and 5 descriptions use identical rubric text. What separates them is sophistication in the writing. A 4 hits every requirement well; a 5 does the same thing with more polish, precision, and depth. The line is fine and honestly somewhat subjective on the reader's part. The most useful way to see the difference is to read scored sample 4s and 5s side by side on AP Central. ## How to Write It ### Phase 1: Read widely and track perspectives Your lit review starts with little-r research: reading the scholarly conversation around your topic. As you collect sources, don't just record what each one says. Note its perspective, its method, what it agrees with, what it contradicts, and what it leaves unanswered. You're hunting for [relationships](/ap-research/unit-4 "fv-autolink"): agreements in data, disagreements in [conclusions](/ap-research/unit-2/review/study-guide/YhQopEVX5BebgSd0IOOe "fv-autolink"), one study extending another. Those relationships are the raw material of synthesis. While you read, also vet each source for [credibility](/ap-research/key-terms/credibility "fv-autolink"). Peer-reviewed journal articles, academic books, and scholarly conference papers belong here. Blog posts and news coverage generally don't, and leaning on them is a fast route to the bottom of the rubric. ### Phase 2: Outline by theme, not by source The single easiest way to make perspectives feel naturally explained and analyzed is to outline your lit review into thematic sections before you draft. Each section covers one aspect of your topic, and the sections build toward your research question. Here's an editorial example from a real AP Research paper: a lit review on Marxist film theory split into three sections. "Marxism and Labor" covered the economic foundations of the topic. "Applications of Marxism to Film" connected those foundations to film in a broader sense. "Marxist Film Theory and *Moon*" took the previous two sections and explicitly connected them to the specific film being studied. Each section built on the last, and sources in later sections connected back to points made earlier. That's the structure doing the synthesis work for you. A common visual for this is the funnel: broad context at the top, narrowing through themes, ending at your specific question and gap. ![](https://storage.googleapis.com/ug-images-study-guides/legacy-firebase/images/-LB0bFtW1supY.png) ###### A sample structure of a literature review. Image from the University of Hull ### Phase 3: Synthesize, don't summarize When you draft, every paragraph should do more than report what a source says. For each source, make two things explicit: what it contributes to the body of knowledge, and why it's relevant and credible in connection to your topic. Then connect it to the sources around it. Do these two researchers agree? Does one study complicate another's conclusion? Does a finding in psychology echo a finding in sociology? Think of it as making your sources join hands, each one leading naturally into the next in a logical chain. When you build these bridges yourself, your reader doesn't have to do guesswork about why a source is there, and your gap will feel earned rather than asserted. ### Phase 4: Land the gap The final move of your lit review answers the question your reader is now asking: "okay, we just looked at all of these sources, so what are *you* going to do?" Your answer sounds something like: "These sources have established [something] about my discipline, but no one has addressed [your gap], so this study investigates it." Your gap statement needs to do two things: 1. Show the gap hasn't been covered before. This is justified by everything you just wrote; you walked the reader through what is known, so the missing piece is visible. 2. Explain why the gap matters to your discipline or topic. Signal phrases make this unmistakable. "This paper provides new insight on..." and "However, [name the specific researchers] have overlooked [your gap]" tell the reader exactly where the existing conversation ends and your contribution begins. Get this right, because your gap is the foundation for everything that follows: your [methodology](/ap-research/academic-paper/ap-research-paper-methodology-fiveable/study-guide/guRojbEHpvd0foYX9frL) has to align with it, and your [conclusion](/ap-research/academic-paper/ap-research-paper-conclusion-fiveable/study-guide/96ONziYAleTuZzSntDim) has to show you filled it. ## Common Mistakes - **The source spaghetti.** This is the one thing you should never do: listing sources one after another with a brief summary each, no plan, no connections, no rhyme or reason. It reads like a bowl of spaghetti, muddled and unfocused, and it maps directly onto the 3-level rubric description (perspectives present, connections missing). Fix: outline by theme first, and make every paragraph reference at least one relationship between sources. - **Listing what sources say instead of analyzing what is known.** This is the most common student mistake, and it produces a weak review and a murky, undeveloped gap. Fix: after summarizing a source, add a sentence of analysis. What does this finding mean for the conversation? What does it leave open? - **Leaning on non-scholarly sources.** News articles, blogs, and pop-science pieces drag your lit review toward the bottom of the rubric. Fix: build your review on peer-reviewed work, and cite everything properly in your [bibliography](/ap-research/academic-paper/ap-research-bibliography-citation-fiveable/study-guide/AMRCZETVX2IQ0WUm77SQ). - **Presenting one perspective.** If every source agrees, you haven't reviewed the conversation; you've reviewed one side of it. Fix: deliberately seek sources that oppose, compete with, or complicate each other, then evaluate them. - **A vague or unjustified gap.** "Not much research exists on this" is not a gap statement. Fix: name the specific researchers or strands of literature, state precisely what they overlooked, and explain why it matters. - **Never connecting sources to your topic of inquiry.** Every source you mention has to connect to your topic at some point, or there's no reason for it to be there. Fix: for each source, state its relevance to your project explicitly. This also makes your gap easier to justify later, since every source is already established as relevant. ## Practice and Next Steps Your next steps: start your little-r research, collect scholarly sources, sort them into themes, and get connecting. Once your lit review establishes the gap, move on to the section that explains how you'll fill it, the [Methodology](/ap-research/academic-paper/ap-research-paper-methodology-fiveable/study-guide/guRojbEHpvd0foYX9frL). Later, your [Discussion and Analysis](/ap-research/academic-paper/ap-research-paper-discussion-analysis/study-guide/1Cz71PCLhFlIfqkkmeu6) will circle back to the literature you reviewed here, showing how your findings extend the conversation. For the full picture of how every section fits together in the 4,000-5,000 word paper, see the [Academic Paper overview](/ap-research/academic-paper), and keep the [AP Research key terms glossary](/ap-research/key-terms) handy as you write. ## FAQs ### What is the literature review in the AP Research academic paper? The literature review synthesizes existing scholarly work on your topic and situates your research question within a gap in the current field of knowledge. It's part of the required Introduction and Literature Review element of the 4,000-5,000 word academic paper, which is College Board scored and worth 75% of your AP Research score. ### How long should the AP Research literature review be? There's no official required length, but the literature review typically runs about 1,200-1,500 words, roughly the first quarter to third of the 4,000-5,000 word paper. The exact length varies by discipline and paper format, so check sample papers in your field for the norm. ### What is the difference between a literature review and a summary of sources? A summary lists what each source says one by one (the 'source spaghetti'), while a literature review puts sources in conversation, showing where they agree, conflict, and build on each other. On the scoring guidelines, papers that include varying perspectives but never connect them land around a 3, so synthesis is what separates a strong lit review from a weak one. ### What counts as a scholarly source for the AP Research lit review? Peer-reviewed research papers, academic books, and scholarly journal articles count as scholarly; news articles and blog posts do not. Papers scoring at the bottom of the lit review rubric row typically rely on non-scholarly works, so build your review on peer-reviewed sources and cite them in your [bibliography](/ap-research/academic-paper/ap-research-bibliography-citation-fiveable/study-guide/AMRCZETVX2IQ0WUm77SQ). ### How do you identify and state a research gap in AP Research? First show what's already known by synthesizing the scholarly literature, then point to what those specific researchers haven't addressed and explain why it matters to the discipline. Signal phrases like 'This paper provides new insight on...' or 'However, [specific researchers] have overlooked...' make the gap unmistakable, and your method must then align with filling it. ### How much is the academic paper worth in AP Research? The academic paper is worth 75% of your AP Research score and is scored by College Board; the presentation and oral defense makes up the other 25% and is scored by your teacher. 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