Assess the reliability of a source by weighing its provenance, content and tone, and explain why it can or cannot be fully trusted

What this dot point is asking

SEAB wants you to judge whether a source can be trusted as evidence, and to justify that judgement. The key word is reliability: not whether the source is interesting, but whether you should believe what it tells you. The skill that earns marks is using the provenance, who produced the source, when, for whom and why, alongside its content and tone. A weak answer only retells what the source says. A strong answer asks who is speaking and what reason they might have to shape the message, then reaches a balanced verdict.

The answer

Reliability is about trust, not truth

A reliable source is one you can depend on for an accurate, balanced account. A source can be sincere and still unreliable, for example a person honestly reporting only the part of an event they happened to see. Reliability is a judgement about how much weight to put on the source, and it almost always depends on more than the words themselves.

Use the provenance first

The attribution, the line telling you who made the source, when and why, is the most powerful tool. Ask three questions:

1. Who produced it? Someone with an interest in the outcome (a developer selling flats, a government defending a policy, a group protesting it) has a reason to present a one-sided picture.
2. Why was it produced? A source made to persuade, advertise or reassure is more likely to be selective than one made simply to record or inform.
3. When and how? A source written long after an event, or based on a tiny or unrepresentative sample, may be less dependable than a careful, timely, broad-based one.

Then weigh content and tone

After provenance, look at the source itself:

• One-sided or balanced? A source that admits nothing against its own view is more suspect than one that acknowledges other sides.
• Emotive or measured? Exaggerated, emotional language ("a flood", "a triumph", "every resident will benefit") signals an attempt to persuade rather than inform.
• Specific or vague? Precise, checkable detail tends to be more reliable than sweeping generalisation.

Unreliable does not mean useless

A vital top-band point: even a one-sided or biased source is still useful, just for a different question. A developer's glowing statement is unreliable as evidence of a project's true effect, but it is excellent evidence of how the developer wants the project to be seen. Always note what an unreliable source can still tell you.

Reach a balanced judgement

Avoid a flat "reliable" or "unreliable." Good answers weigh both directions: a reason to trust and a reason for caution, then commit to an overall verdict. "On balance the source is fairly reliable because... although it should be treated with care because..." is the shape markers reward.

Examples in context

Example 1. A campaign group's leaflet. A leaflet from a group campaigning against a new policy is unreliable as a balanced account of the policy, because the group exists to oppose it and the leaflet is designed to persuade, with emotive language and no mention of benefits. It is, however, reliable evidence of the objections that opponents raise, which can be useful in a "how far do the sources support" question that needs the case against.

Example 2. An official population statistic. A population figure published by the national statistics department is generally reliable, because the department's job is to record accurate data and it has no interest in distorting routine figures. Even so, a careful answer notes that how a category is defined (for example who counts as a resident) can shape the number, so the figure should be read alongside its definitions rather than taken as beyond question.

Try this

Q1. Explain why provenance is more important than content when judging reliability. [2 marks]

• Cue. Provenance tells you who made the source and why, which reveals any interest or intention to shape the message; the content alone cannot show whether the account is balanced or one-sided.

Q2. A restaurant owner posts that "our hawker centre is the cleanest and friendliest in Singapore." How reliable is this as evidence of the centre's quality? [3 marks]

• Cue. Not reliable as a fair account: the owner has an interest in attracting customers and the language is promotional and one-sided; it is reliable only as evidence of how the owner wishes the centre to be seen.

Q3. Why is it wrong to call a biased source completely useless? [2 marks]

• Cue. A biased source is unreliable for a balanced account but is still useful evidence of its maker's view, attitude or intention, which can answer a different question about the issue.