Introduction to Comparing and Contrasting Sources

Welcome to one of the most important skills in your IB History toolkit! Whether you are preparing for the 2027 exams or the new 2028 curriculum, being able to look at two different accounts of the same event and spot the similarities and differences is essential. Think of it like being a detective: you have two witnesses, and you need to figure out where they agree and where their stories diverge.

In the Paper 1 exam, this skill is tested directly. It isn't just about reading; it’s about linking ideas together to show a deep understanding of historical perspectives.

Note: This chapter focuses specifically on comparing and contrasting. For information on how to interpret a single source, see the chapter on "Understanding and interpreting sources."

What Does "Compare and Contrast" Actually Mean?

The IB uses these terms very specifically. To get full marks, you must do both:

  • Compare: Find the similarities. What do both sources agree on? What themes do they both mention?
  • Contrast: Find the differences. Where do they disagree? Does one source emphasize something the other ignores?

The 2027 vs. 2028 Exam Format

For 2027 Sessions: This is usually Question 3 on Paper 1. It is worth 6 marks. The goal is to find roughly 3 similarities and 3 differences. You should aim to write two clear paragraphs: one for comparisons and one for contrasts.

For 2028 Sessions: This skill is integrated into Question 1 (understanding content across two sources) and Question 3 (synthesis of perspectives). While the question structure is slightly different, the skill of spotting "points of agreement and disagreement" remains the foundation of your answer.

The Golden Rule: The "Running Comparison"

The biggest mistake students make is writing a paragraph about Source A, then a paragraph about Source B, and leaving it at that. Do not do this! This is just summarizing, not comparing.

Instead, use a running comparison. This means you talk about both sources in the same sentence or back-to-back sentences. You are constantly "tossing the ball" between Source A and Source B.

Analogy: Imagine comparing two smartphones. You wouldn't list every feature of an iPhone and then every feature of a Samsung. Instead, you’d say, "Both phones have great cameras (Similarity), but the iPhone uses iOS while the Samsung uses Android (Contrast)."

Step-by-Step Process for Success

Step 1: The "Point-by-Point" Scan

Read the two sources side-by-side. As you read, use a highlighter or underline key points. Ask yourself:

  • Do they both mention the same person or event?
  • Do they have the same attitude (e.g., are they both critical of a leader)?
  • Do they give the same reason for why something happened?

Step 2: Structure Your Answer

For a 6-mark question, use a simple two-paragraph structure:

  1. Paragraph 1: Comparisons. Start with: "Sources A and B are similar in that..."
  2. Paragraph 2: Contrasts. Start with: "However, the sources contrast in that..."

Step 3: Use Connective Words

To show the examiner you are comparing, use "signpost" words. These are like road signs that tell the reader where your argument is going.

  • For Comparisons: Similarly, likewise, both sources suggest, in the same way, Source A is supported by Source B regarding...
  • For Contrasts: On the other hand, conversely, whereas, however, while Source A claims X, Source B argues Y...

Helpful Sentence Starters

If you're feeling stuck, try using these templates to build your sentences:

For Comparison:
"Both Source A and Source B agree that the primary cause of the conflict was..."
"Source A suggests that the protest was peaceful, a view which is mirrored in Source B..."

For Contrast:
"Source A focuses on the economic impact of the treaty, whereas Source B emphasizes the political consequences."
"While Source A claims the leader was popular, Source B suggests there was significant internal opposition."

Common Pitfalls to Avoid

1. "The One-Sided Answer": Only finding similarities but forgetting contrasts (or vice-versa). You need both for high marks!

2. "The Summary Trap": Writing a long description of Source A without mentioning Source B until the very end. Pro-tip: Try to mention both source names in every second sentence.

3. "Origin Obsession": In this specific question, you are comparing content (what they say). Don't waste time talking about who wrote the source or when (save that for the "Value and Limitations" question!).

4. "Ignoring the Prompt": Always check the specific question. If it asks how they compare regarding "the causes of the war," don't talk about the "effects of the war."

Quick Review: Key Takeaways

  1. Direct Links: Always mention both sources together.
  2. Balance: Aim for a healthy mix of similarities and differences.
  3. Signposting: Use words like "whereas" and "similarly" to guide the examiner.
  4. Focus: Stick strictly to what the sources reveal about the topic in the prompt.

Don't worry if this seems tricky at first! With a little practice, you'll start seeing patterns and connections between sources almost instantly. It’s a skill that gets much easier the more you do it.