MODULE 1 · SOURCE TYPES · 30–45 MINUTES

Primary, secondary, tertiary — and why the question matters

The conventional model

Primary source: evidence created within or directly connected to the event, people, period, place or phenomenon being investigated.

Secondary source: later interpretation, analysis, explanation or argument that draws on evidence and often on other scholarship.

Tertiary source: synthesis or reference material that organises existing knowledge to help readers orient themselves.

Important: these categories describe a source's relationship to your inquiry. They are not automatic quality rankings.

The first senior move: classify for a question

A source does not carry a permanent sticker saying PRIMARY or SECONDARY. The same item can play a different role when the research question changes.

Case

1976 newspaper article

Question A: What happened during a police operation?

The article is contemporary evidence but contains reporting and interpretation of the event; you still need to ask what its journalist actually witnessed and what came from officials or others.

Same source, different question

1976 newspaper article

Question B: How did newspapers portray Pacific migrants in 1976?

Now the newspaper itself is direct primary evidence of media framing, vocabulary, selection and representation.

Ambiguous cases are the point

For each, write two different research questions that could make the source function differently.

Oral history recorded 40 years later

Direct testimony? Later memory? Evidence of both, depending on the question.

Autobiography

First-person evidence about memory and self-presentation, but also a later interpretation of a life.

Documentary

Usually secondary interpretation as a whole; may embed archival footage, interviews or documents that are themselves primary sources.

Government statistics

Primary evidence of what an official collection measured and reported; still shaped by definitions, methods and decisions about what to count.

Social-media post by a participant

Primary for what that person publicly said at that moment; not automatic proof that everything claimed in the post happened as described.

Historian who witnessed the event

The person's later scholarship can be secondary analysis while their direct memory is a primary evidentiary element.

Saved generative-AI transcript

If you are researching how an AI system framed a topic on a particular date, the saved interaction can be primary evidence of that output. It is not automatically primary evidence that the historical or social claims inside the output are true.

Reject these shortcuts

  1. “Primary = true.” Primary sources can lie, forget, exaggerate, misunderstand, omit or manipulate.
  2. “Secondary = less useful.” Good scholarship may compare a far wider evidence base than any single witness could access.
  3. “Tertiary = bad.” Tertiary material can be excellent for orientation, vocabulary and finding references; it simply should not be mistaken for the end of an evidence chain.
  4. “AI = a new permanent source category.” AI mediation matters, but the role of a saved output still depends on the research question.

Practice: source role, not source label

Choose one topic you may study this year. Find or imagine:

  1. one item that could be primary evidence for your question;
  2. one secondary interpretation;
  3. one tertiary orientation source;
  4. one item whose classification changes if you change the research question.

For each, complete this sentence:

This source is useful as ______ for my question because ______. It cannot by itself establish ______.
Year 13 extension: source type is not epistemic authority

Ask whether the primary/secondary/tertiary taxonomy is really a hierarchy of knowledge, or simply a map of distance and function. A secondary historian may have stronger grounds for a causal claim than any single primary witness because the historian can triangulate archives, statistics, testimony and earlier scholarship. Conversely, a secondary interpretation can also inherit the blind spots of the archive it uses.

Extension prompt: Is “closer to the event” always “closer to the truth”? Build a two-sided argument.

Mastery check

You are ready to move on if you can explain all three:

If you cannot yet explain one, revisit the ambiguous cases before continuing.