How to write a synthesis essay, with a matrix, outline and example

This guide is for high school students preparing for AP English Language, and for college and graduate students writing source-based essays and literature reviews. It belongs to our series on essays and sources; the hub is what is a thesis statement.

What does synthesis mean?

Synthesis means combining ideas from different sources to say something none of them says alone. Purdue OWL describes synthesis as making connections between sources, showing how they relate rather than reporting each one separately [1].

The difference from summary is the unit of organization.

Graff and Birkenstein describe academic writing as entering a conversation: you report what others say, then add what you say in response [2]. Synthesis is that move with several voices at once.

What are the two types of synthesis essay?

An argumentative synthesis uses sources to support a position; an explanatory synthesis uses them to explain a topic without taking a side.

A literature review in a thesis is usually explanatory synthesis with an argument at the end: it maps what is known, then argues for the gap your study fills. See how to write a literature review.

What is the AP Lang synthesis essay?

It is the first of three free-response questions on the AP English Language and Composition exam: students read six sources on one topic and write an argument that combines and cites at least three of them [3].

What the College Board's exam page states, checked on 14 November 2026 [3]:

The course and exam description sets out the scoring. As commonly described, each free-response answer is scored on a 6-point analytic rubric: a thesis point, up to four points for evidence and commentary, and one point for sophistication [4].

The College Board does not set a time per question, but students commonly use about 40 minutes of writing time per essay after the reading period.

What this means for your answer:

• Take a position. The task asks for an argument, not a survey of the sources.
• Use at least three sources, and use them well. The evidence and commentary points reward explaining how each source supports your line of reasoning, not quoting as many as possible.
• Treat the visual source as evidence. A chart or cartoon can carry a paragraph if you explain what it shows.
• Cite as the prompt asks, usually by source letter or by the description in parentheses, for example (Source C).

How to write a synthesis essay in six steps

1. Read the prompt and turn it into a question. "Evaluate the most important factors a school should consider before allowing laptops in class" becomes "What should decide a school's laptop policy?"
2. Read every source once, quickly. Note each one's position and its type (study, opinion, data, image). For college work, check each source: see primary vs secondary sources and how to evaluate source credibility.
3. Build a synthesis matrix (next section). This is where synthesis happens.
4. Write your thesis from the patterns in the matrix, not from one source.
5. Plan paragraphs by idea. Each column cluster in the matrix becomes a paragraph.
6. Draft, then check with the checklist at the end.

How to build a synthesis matrix

A synthesis matrix is a table with sources as rows and themes or questions as columns; you fill each cell with a short note, then read down the columns. The columns are your possible paragraphs.

Here is a matrix on laptop note-taking, built from four real studies (cell notes are short paraphrases; read the papers for detail).

Reading down the columns:

• Notes quality: all three studies that measured it agree that laptop notes are longer and more verbatim.
• Learning outcome: the original finding did not hold up in two later replications.
• Distraction: the evidence comes from a different line of work and points one way.

That gives a thesis the sources support together: laptops harm learning mainly through distraction, not through how students type notes. No single source says that.

You can build this matrix in the browser with the free literature review matrix builder: paste a DOI to fill a row, add your own columns, and export to CSV or a table.

How to structure a synthesis paragraph

Open with your claim, bring in two or more sources that bear on it, show how they relate, and close with what that means for your thesis. One way to remember it:

1. Claim: your point, in your words.
2. Source A: evidence, with citation.
3. Relation: a phrase that links sources: "similarly", "in contrast", "however", "this is consistent with", "a later replication found".
4. Source B (and C): evidence that agrees, qualifies or conflicts.
5. Commentary: what the pattern shows, and how it supports the thesis.

Example synthesis paragraph

The paragraph below uses the four real studies in the matrix. Check the papers before you rely on the summaries.

The strongest argument against laptops in lectures is not that typing produces worse notes, but that screens invite distraction. Mueller and Oppenheimer (2014) found that students who typed their notes recorded more of the lecture word for word and did worse on conceptual questions than students who wrote by hand. That result has not held up well. In a direct replication, Urry et al. (2021) again found that laptop notes were longer and more verbatim, yet laptop users did not score worse on the quiz, and a small meta-analysis of similar studies pointed the same way; Morehead, Dunlosky and Rawson (2019) also did not find a clear advantage for longhand. The evidence on distraction is more consistent: Sana, Weston and Cepeda (2013) found that students who multitasked on a laptop understood less of a lecture, and so did classmates who could merely see their screens. Taken together, these studies suggest that a policy targeting off-task use, rather than the keyboard itself, addresses the harm the research actually supports.

What makes this synthesis, not summary:

• The first sentence is the writer's claim, not a source.
• Sources are grouped by what they show (the note-taking finding and its replications; then distraction).
• Transition phrases ("That result has not held up well", "more consistent") carry the writer's judgment.
• The last sentence says what the sources mean together.

The same paragraph as summary would read: "Mueller and Oppenheimer (2014) studied... Sana et al. (2013) studied... Urry et al. (2021) studied..." Each source would get its own sentence block, and the reader would have to do the synthesis.

Synthesis essay outline

Use this outline for a five-paragraph timed essay or expand it for a longer paper.

1. Introduction
   • One or two sentences on the debate or problem.
   • Thesis: your position and main reason.
2. Body paragraph 1: your strongest point
   • Claim, two sources, commentary.
3. Body paragraph 2: your second point
   • Claim, one or two sources (a visual or data source works well here), commentary.
4. Body paragraph 3: the counterargument
   • State the best opposing view fairly, with a source.
   • Answer it: concede part, then show why your position still holds.
5. Conclusion
   • Restate the thesis in new words.
   • Say what follows: a recommendation, a remaining question, or what the reader should weigh.

Example thesis statements for synthesis essays (illustrative)

• "Schools should allow laptops for note-taking but restrict other uses during class, because the evidence on distraction is stronger than the evidence on typed notes."
• "Although public libraries now lend more e-books than ever, cities should keep funding physical branches, because branches serve as free study and internet spaces that e-books cannot replace."
• "A city considering a congestion charge should weigh air quality and bus speeds above revenue, since revenue estimates vary widely while health effects are the reason for the policy."

For more on writing and fixing thesis statements, see what is a thesis statement.

Common mistakes

• Source-by-source paragraphs. If each paragraph starts with a source name, you are summarizing. Start with your claim.
• Dropping quotes without commentary. Every source needs a sentence that says why it matters to your point.
• Using sources only to agree. A source that disagrees, answered well, strengthens the essay.
• Ignoring the visual source in AP Lang, or describing it without drawing a conclusion from it.
• Treating all sources as equal. A replication with a larger sample is stronger evidence than an opinion column. Say so.

Synthesis essay checklist

1. Does the thesis take a position that draws on more than one source?
2. Does each body paragraph open with your claim, not a source?
3. Does each body paragraph use at least two sources, or explain why one is enough?
4. Have you used at least three sources (AP Lang) or the number your assignment requires?
5. Do transitions show how sources relate (agree, qualify, conflict)?
6. Have you addressed at least one opposing view?
7. Is every source cited in the format required?
8. Does the conclusion say what the sources show together?

How to write a synthesis essay with AI for Research

AI for Research helps you find sources and see how they relate. The claim, the grouping and the sentences are your work.

1. Find sources (free). Search 250M+ scholarly works in Find Papers with filters for year and study type, and save the ones you will use to your Library.
2. Fill the matrix (free). In the literature review matrix builder, paste each DOI to fill a row with the title, authors and year, then add your own theme columns and notes. Export it as CSV or a table. It runs in your browser with no account.
3. Read the papers. Chat with PDF can point you to the passage that answers a column question, so you can read it in context and paraphrase it yourself.
4. Check the structure. The essay writer produces a thesis and outline for your question with real citations. Compare it with your own plan to spot a missing counterargument or a weak paragraph. Many courses forbid submitting AI-written text, and the AP exam is written by you alone, so use it only to practice planning.
5. Cite (free). Format the references with the citation generator.

The free plan includes 45 credits a month; search, citations and the matrix builder cost nothing. See pricing. Limits: the matrix builder fills bibliographic details, not your notes, and the AP exam gives you its own sources, so practice the matrix method on paper under time.

FAQ

What is a synthesis essay?

A synthesis essay combines ideas from several sources to support one claim of your own. Instead of summarizing each source in turn, you group sources by the point they help you make, show where they agree or disagree, and explain what the pattern means. The thesis is yours; the sources are evidence. It is a common assignment in AP English Language and in college writing courses.

What is the difference between synthesis and summary?

A summary restates one source in shorter form. Synthesis connects several sources to answer a question none of them answers alone. A summary paragraph is organized by source ('Smith says... Jones says...'). A synthesis paragraph is organized by idea: it opens with your claim, brings in two or more sources that bear on it, and ends with what their agreement or tension shows.

How many sources do you need in an AP Lang synthesis essay?

The College Board's exam page says students read six sources on one topic, including visual and quantitative sources, and write an argument that combines and cites at least three of them. Using three well is better than mentioning all six briefly. Check the current course and exam description before the exam, since the College Board can change the format.

How do you start a synthesis essay?

Start with the question, not the sources. Read the prompt, then read all the sources and note each one's position in a matrix. Decide what you think, write a one-sentence thesis, and only then plan paragraphs. In the essay itself, open with a short context sentence or two about the debate and end the introduction with your thesis.

What is a synthesis matrix?

A synthesis matrix is a table with one row per source and one column per question or theme. Each cell holds a short note on what that source says about that theme. Reading down a column shows where sources agree or conflict, which is where your paragraphs come from. It works for synthesis essays and literature reviews alike.

Next steps

• Sharpen the claim at the center: what is a thesis statement.
• Prepare for the next AP Lang question: rhetorical analysis.
• Choose better sources: how to evaluate source credibility.
• Scale the method up to a thesis chapter: how to write a literature review.
• Cite each source correctly: how to cite evidence.

Sources

1. Purdue OWL. Synthesizing sources. https://owl.purdue.edu/owl/research_and_citation/conducting_research/research_overview/synthesizing_sources.html
2. Graff, G., & Birkenstein, C. (2021). They Say / I Say: The Moves That Matter in Academic Writing (5th ed.). W. W. Norton.
3. College Board, AP Central. AP English Language and Composition exam. https://apcentral.collegeboard.org/courses/ap-english-language-and-composition/exam (checked 14 November 2026)
4. College Board. AP English Language and Composition course and exam description. https://apcentral.collegeboard.org/courses/ap-english-language-and-composition
5. Mueller, P. A., & Oppenheimer, D. M. (2014). The pen is mightier than the keyboard: Advantages of longhand over laptop note taking. Psychological Science, 25(6), 1159–1168. https://doi.org/10.1177/0956797614524581
6. Sana, F., Weston, T., & Cepeda, N. J. (2013). Laptop multitasking hinders classroom learning for both users and nearby peers. Computers & Education, 62, 24–31. https://doi.org/10.1016/j.compedu.2012.10.003
7. Morehead, K., Dunlosky, J., & Rawson, K. A. (2019). How much mightier is the pen than the keyboard for note-taking? A replication and extension of Mueller and Oppenheimer (2014). Educational Psychology Review, 31(3), 753–780. https://doi.org/10.1007/s10648-019-09468-2
8. Urry, H. L., Crittle, C. S., Floerke, V. A., et al. (2021). Don't ditch the laptop just yet: A direct replication of Mueller and Oppenheimer's (2014) Study 1 plus mini meta-analyses across similar studies. Psychological Science, 32(3), 326–339. https://doi.org/10.1177/0956797620965541