Synthesis is one of the highest-order skills in historical thinking. It's the ability to take information from multiple sources, recognize how they relate to each other, and weave them into a coherent narrative or argument. Yet it's also one of the most overlooked skills in DBQ instruction. Teachers assign the essays expecting synthesis, but students who haven't been explicitly taught this move often default to document-by-document summary.

What Synthesis Isn't

Synthesis isn't just mentioning multiple documents. It's not saying, 'Document A says X. Document B says Y.' It's not alternating between sources in sequential paragraphs. It's not a bullet-point list masquerading as an essay. These are common student attempts that look like synthesis but lack genuine integration.

What Synthesis Actually Looks Like

Synthesis means using documents together to develop an insight. A soldier's letter and a supply officer's memo paint different pictures of resource scarcity—one from lived experience, one from official planning. Synthesizing these doesn't mean simply noting the difference; it means recognizing that their disagreement tells us something important about the gap between policy and reality. That insight is synthesis.

Or, multiple documents reveal competing values in a society. Rather than treating each document's perspective separately, the student recognizes the debate that connects them and uses that debate to explain historical conflict or change. The documents aren't just evidence of what happened; they're windows into how different groups understood what was happening differently.

• Show students examples of synthesis in academic writing. How do historians use multiple sources to develop arguments?
• Create activities where synthesis is the explicit goal. Give students three documents and ask them to identify one insight that emerges from reading all three together.
• Model synthesis in class discussions. Point out when documents corroborate or contradict each other and what that tension reveals.
• Give synthesis-specific feedback. 'You've shown good understanding of each document separately. Now, what do they teach us together?'

Sentence Frames for Synthesis

Give students language to practice synthesis. 'While Document A emphasizes [X], Document B reveals [Y]. Together, they suggest that [synthesis].' 'The contrast between Document A and Document B illuminates [historical point].' 'Multiple documents converge on the idea that [synthesis].' These frames make the move concrete until students can execute it independently.

As students internalize synthesis, their DBQs deepen. Essays shift from cataloging sources to using sources as thinking partners, building arguments that no single document contains but all of them inform.