Primary, secondary and partisan sources explained

The short answer

Primary, secondary and partisan sources explained

In political information, primary sources are the original, first-hand records of an event or decision — the legislation itself, the official data release, the court judgment, the Hansard transcript, the agency report. Secondary sources analyse, interpret or summarise primary sources — a think-tank report, a news article, an academic paper. Partisan sources advocate for a particular interest or party — a political advertisement, a party press release, an activist campaign. Each category has value if you know which it is, but mistaking a partisan source for a primary source, or a secondary source for a neutral account, leads to misunderstandings about what is fact, what is interpretation and what is advocacy.

This guide helps verify public political material. It does not infer a person’s motive from one post and does not treat disagreement as proof of deception.

The useful question is not only “what is the rule?” but also “who administers it, which document controls it, and when might it change?” That distinction prevents an accurate general explanation from becoming wrong advice in a particular election, chamber or policy setting.

Evidence review

What counts as a primary source in Australian politics

Primary sources in Australian politics are original, first-hand records that have not been filtered through interpretation or commentary. Examples include the text of an Act of Parliament as published on the Federal Register of Legislation, the Hansard transcript of what was actually said in parliamentary debate, a High Court judgment, an Australian Bureau of Statistics data release, an Australian Electoral Commission electoral return disclosing political donations, a budget paper tabled in Parliament, an Auditor-General report, a Productivity Commission inquiry report, and the formal record of a parliamentary committee hearing.

A primary source gets you as close as possible to the underlying fact, decision or event. However, primary sources are not necessarily easy to understand without context — a piece of legislation may be hundreds of pages in legal language; a statistical data cube may require knowledge of the methodology. Using a primary source effectively often means combining it with reliable secondary analysis that helps you interpret what the primary source means.

Evidence review

What counts as a secondary source and how to evaluate it

Secondary sources summarise, analyse or contextualise primary sources. Examples include a news report on a budget measure that quotes the budget papers, an academic article that analyses voting patterns using AEC data, a Parliamentary Library research brief that summarises the history and effect of a bill, a think-tank report that evaluates the evidence on a policy question, and a fact-check published by an accredited organisation that cites the primary sources it relies on.

A good secondary source will cite its primary sources so you can check them yourself. It will distinguish between fact and opinion, acknowledge uncertainty and limitations, and present competing interpretations where they exist. A weaker secondary source will assert conclusions without linking them to verifiable primary evidence, present opinion as fact, or selectively cite sources that support only one side of a contested question.

Evidence review

What counts as a partisan source and how to recognise it

A partisan source exists to advocate for a political party, candidate, interest group or ideological position. Examples include a party's election platform, a candidate's campaign website, a union or industry association's media release on a policy decision, a political action committee's advertising, a lobby group's research report that frames the evidence to support a pre-determined conclusion, and an opinion piece published by a politician or advocate.

Partisan sources are not inherently unreliable — a party's statement of what it would do if elected, for instance, is a valid piece of information about that party's intentions. But a partisan source should be treated as advocacy, not as neutral evidence. A number cited in a party press release may be correct, but the framing, context, counter-arguments and caveats will almost certainly be omitted. When you encounter a partisan source, verify its factual claims against primary and independent secondary sources before accepting them.

Evidence review

The spectrum problem: when a source straddles categories

In practice, many sources do not fit neatly into one category. A parliamentary committee report, for example, is produced by a body of the Parliament — arguably making it a primary source — but it also contains analysis, interpretation and recommendations, which are secondary functions. A government department's annual report contains both primary data (financial statements, staffing numbers) and secondary narrative (the minister's summary, performance analysis). A media organisation may publish straight news reporting (secondary) alongside opinion columns (partisan).

The key is to identify which part of the source you are relying on and for what purpose. The financial data in an annual report is primary-source evidence of expenditure; the minister's commentary on that expenditure is not. The transcript of a parliamentary speech is primary evidence of what was said; the politician's characterisation of an opponent's position during that speech is partisan advocacy within a primary record. Being specific about what you are claiming and which part of which source supports it is better than assigning a single label to an entire document.

Evidence review

How the AEC Stop and Consider campaign helps voters assess sources

The Australian Electoral Commission's Stop and Consider campaign encourages voters to pause and ask three questions when they encounter electoral information: who is the author, what is the source, and why was it created. These three questions map directly onto the primary-secondary-partisan framework. If the author is the original creator of the data or text and is an official institution, the source is likely primary. If the author is analysing or interpreting someone else's work, it is likely secondary. If the author has a clear stake in the outcome, the source is likely partisan.

The AEC's campaign emphasises that even during election periods, when partisan advertising is at its peak, voters can equip themselves by checking multiple sources and looking for official information. The AEC publishes its own fact-checks and corrections on its disinformation register, providing a concrete illustration of how official primary-source information can be used to test claims made by partisan actors.

Evidence review

Practical steps for checking a political claim against its source

When you encounter a political claim, follow this sequence. First, identify whether the claim reports a fact (something that can be verified) or expresses an opinion (a judgement that cannot be tested against evidence). If it is a factual claim, find the primary source: if the claim is about a law, go to legislation.gov.au; if it is about statistics, go to abs.gov.au; if it is about what was said in Parliament, go to aph.gov.au and search Hansard; if it is about election results, go to aec.gov.au.

Second, if you cannot find the primary source, check whether a credible secondary source — such as the Parliamentary Library, a non-partisan fact-checking organisation or an academic analysis — has examined the claim. Third, consider the partisan context: who benefits if this claim is accepted as true, and would they have an incentive to present it selectively? Fourth, if the claim cannot be traced to any primary or credible secondary source, it should be treated as unverified, regardless of how confidently it is asserted.

Common questions

Before you rely on the answer