In simple terms
A friendly intro before the formal notes — no formulas yet.
Weaving History's Threads
Comparison and synthesis involve more than just listing what two sources say. It's about weaving their perspectives together to create a richer, more complex understanding of a historical event, explaining why they might agree or disagree.
Imagine two friends describing a party you missed. One says it was wild and amazing; the other says it was quiet and boring. To understand what really happened, you wouldn't just repeat their two stories. You'd compare their specific claims (who was there, what music was playing) and consider who they are (one loves huge crowds, the other prefers small gatherings) to create a single, more accurate picture of the event. That's synthesis.
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Identify the main argument or perspective of each source in relation to the question.
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Systematically compare and contrast the sources, focusing on specific themes, evidence, and claims.
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Explain the reasons for similarities and differences by analysing the sources' origin, purpose, and historical context.
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Construct a concluding judgement that directly answers the question by weighing the combined evidence from the sources.
Explore the concept
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Key formulas
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Full topic notes
Formal explanation with the rigour you need for the exam.
Beyond Listing: True Comparison and Contrast
In everyday language, 'comparison' can just mean looking for similarities. In IB History, comparison requires you to examine both similarities (points of agreement) and differences (points of contrast). A strong answer gives balanced attention to both. You must move beyond surface-level observations like 'Both sources are about the Cold War' to specific, evidence-based points of comparison and contrast.
Content: Compare the specific facts, statistics, and events mentioned.
Perspective/Argument: What is the main argument each source is making about the topic?
Emphasis: What aspects of the event does each source choose to focus on or highlight?
Omissions: What does a source leave out, and how does that contrast with what another source includes?
Tone: Compare the language and emotional register. Is it propagandistic, objective, personal, critical?
The Power of Synthesis: Creating a New Understanding
Synthesis is the step beyond comparison. It means you are not just listing points of agreement and disagreement, but explaining their significance. Why do these sources, with their unique origins and purposes, present the information in the way they do? Synthesis involves using the sources as building blocks to construct your own, more nuanced, argument in response to the question.
The most common mistake is structuring your answer sequentially: a paragraph on Source A, followed by a paragraph on Source B. Instead, adopt a thematic structure. Each paragraph should be based on a point of comparison (e.g., 'The role of economic factors'), and within that paragraph, you must discuss both sources together.
Structuring for Success
A clear structure is essential. For each thematic paragraph, you should aim to integrate the sources seamlessly. A useful model is to make your point, support it with evidence from the first source, then immediately introduce the second source's perspective on that same point using comparative language ('Similarly...', 'In stark contrast...', 'While Source A emphasises X, Source B focuses on Y...'). Crucially, you must then explain the significance of this similarity or difference, often by referring to provenance.
Worked examples
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Compare and contrast what Source A and Source B reveal about the effectiveness of the League of Nations in the 1930s.
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Source A (fictional): An extract from the private diary of a British diplomat, written in 1936. 'Another failure. The Abyssinian affair has shown the League to be a toothless tiger. Mussolini has defied us all, and France is too fearful of Hitler to act. Our policy of sanctions is a complete sham; oil continues to flow. I fear we are witnessing the complete collapse of collective security.'
With reference to their origin and purpose, compare and contrast the views expressed in Source C and Source D regarding the nature of Stalin's rule in the USSR.
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Source C (fictional): An image of a Soviet propaganda poster from 1937, titled 'Under the Sun of the Stalin Constitution, We Grow Happier Every Day!'. It depicts smiling, healthy workers and farmers marching with banners under a benevolent, sun-like portrait of Stalin.
How it all connects
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Tap a linked idea to see how it connects back to the main topic — that connection is what examiners reward.
Glossary
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Quick check
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Revision flashcards
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What is 'Comparison' in a Paper 1 context?
The skill of identifying both similarities and differences between sources regarding their content, tone, emphasis, and perspective on a specific historical issue.
Key takeaways
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Content: Compare the specific facts, statistics, and events mentioned.
- ✓
Perspective/Argument: What is the main argument each source is making about the topic?
- ✓
Emphasis: What aspects of the event does each source choose to focus on or highlight?
- ✓
Omissions: What does a source leave out, and how does that contrast with what another source includes?
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Tone: Compare the language and emotional register. Is it propagandistic, objective, personal, critical?
Practice — then mark it
The whole point: a real Cambridge question, marked mark-by-mark.
Practise Paper 1 Comparison Questions
Practise Paper 1 Comparison Questions
Extra simulations & links
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Frequently asked
Checkpoint
One marked question is worth ten re-reads — close the loop before you move on.
Reading it isn’t knowing it — prove it.
Before you move on: do Practise Paper 1 Comparison Questions on paper, snap a photo, and get examiner-style feedback on exactly where you win and lose marks.