Introduction: Becoming a Historical Detective

Welcome to one of the most critical skills in your H2 History journey! In the Source-Based Case Study (SBCS), you aren't just reading stories; you are acting as a detective. When you see a source, your first instinct shouldn't be to believe everything it says. Instead, you must ask: "Can I trust this?"

Evaluating reliability is about determining the weight or value of a source as evidence. This chapter focuses on how to use the "metadata" of a source—its Provenance, Purpose, and Audience—to decide if the information is likely to be accurate, or if it has been "coloured" by the author's intentions. This skill is essential for hitting the high marks in Assessment Objective 3 (AO3).

1. The "Big Three": Provenance, Audience, and Purpose

To evaluate a source effectively, you need to look at the provenance (the introductory text at the top of each source). This tells you the who, when, where, and why.

A. Provenance (The "Who" and "When")

The provenance gives you the context. Is the author a Soviet official during the Berlin Blockade? Or a Singaporean diplomat discussing ASEAN cooperation?
Key Questions:

  • Position: Does the author have "insider" knowledge (e.g., a general in the Vietnam War) or are they an outsider?
  • Time: Was the source written at the heat of the moment (primary) or years later (reflective)? A speech from 1945 about the Yalta Conference might have different priorities than a memoir written in 1990.

B. Audience (The "Who is it for?")

Who was intended to hear or read this? The audience dictates the tone and the content.
Common Audience Types:

  • Private: (e.g., a personal diary or a top-secret telegram like Kennan’s Long Telegram). These are often more "reliable" for finding the author’s true feelings because they didn't expect the public to see them.
  • Public: (e.g., a speech, a newspaper article, or a United Nations declaration). These are often designed to "sell" an idea, boost morale, or gain international support.

C. Purpose (The "Motive")

This is the most important part. Purpose is why the source was created. Every source has a goal.
Pro Tip: Use "Verb-Object" phrasing. For example: "The purpose of the Truman Doctrine speech was to persuade the US Congress to provide financial aid to Greece and Turkey."

Don't worry if this seems tricky at first! Just remember: No one writes anything for no reason. In H2 History, authors are usually trying to justify, persuade, condemn, or reassure.

2. The Reliability "Red Flags" and "Green Flags"

How do we decide if these three elements make a source reliable or not?

Red Flags (Reasons to be Cautious)

  • Vested Interest: If a leader is defending their own failed policy (e.g., a US official justifying the Vietnam War), they are likely to hide mistakes.
  • Propaganda: Sources designed to stir up emotion or hatred (common in Cold War posters).
  • Face-Saving: If a source is written after a defeat or crisis to make the author look better.

Green Flags (Reasons to Trust)

  • Admission of Guilt: If a source admits to a mistake or a weakness, it is likely very reliable (it goes against the author's interest).
  • Consistency: If the source's claims match what you know from your Contextual Knowledge (what you learned in the syllabus about the Cold War or Southeast Asian history).
  • Private Nature: Top-secret documents often contain the "ugly truth."

3. Using Contextual Knowledge (CK) to Test Reliability

You cannot evaluate a source in a vacuum. You must use your "History Brain."
If a source from 1967 claims that ASEAN was formed purely for economic reasons, your Contextual Knowledge should tell you that security concerns regarding Communism and the Vietnam War were also huge factors. Therefore, you might argue the source is less reliable because it is omitting key information to look less aggressive.

Quick Review: Reliability = Provenance + Purpose + Contextual Knowledge.

4. Common Mistakes to Avoid

  • The "Bias" Trap: Avoid saying "This source is biased, so it is useless." In H2 History, every source has a perspective. Instead, say: "The source is subjective because the author’s purpose is to justify... however, this tells us exactly how the government wanted to be perceived."
  • The "Primary/Secondary" Myth: Don't assume a primary source is always better. A person in the middle of a riot might not see the "big picture," while a later account might have more facts.
  • Ignoring the Tone: If the language is very "loaded" or emotional (e.g., calling opponents "puppets" or "aggressors"), the reliability of its factual claims might be low, but its reliability for showing attitude is high!

5. Step-by-Step: Writing the Reliability Paragraph

When you are writing your answer for the 30-mark assertion question (Sub-question b), use this structure to evaluate a source:

Step 1: The Claim. State what the source says about the topic.
Step 2: The Evaluation. Look at the provenance. "However, the reliability of this source is questionable because..."
Step 3: The Purpose. Explain the motive. "...the author, being a Soviet official, had a motive to blame the USA for the Berlin Blockade to maintain the 'moral high ground' in the eyes of the global audience."
Step 4: The Comparison/Cross-reference. "This is contradicted by Source B and my own knowledge of the Marshall Plan, which suggests..."
Step 5: The Conclusion. "Therefore, while the source is useful for showing the Soviet perspective, it is not a reliable factual account of the events."

Summary: Key Takeaways

1. Provenance is your map: Always check who wrote it and when.
2. Purpose is the engine: Why was it written? What did the author want the audience to do or think?
3. Cross-reference: Use other sources and your own knowledge of Theme I (Cold War) or Theme III (Southeast Asia) to see if the source "fits" the historical reality.
4. Value in everything: Even an "unreliable" source is useful because it shows us historical empathy—it helps us understand the mindset of people at the time.

Next Step: Learn how to compare two sources in our chapter on "Comparing two sources: similarities, differences and their reasons."