Evaluating Sources: Questions to Ask

No source is simply good or bad

Evaluating a source does not mean sorting material into “reliable” and “unreliable” piles. A source can be excellent for one purpose and weak for another. A newspaper report may be useful for showing how an event was described at the time but poor as the final word on a technical question. A company blog may be a fair source for what the company says about its own product and a poor one for comparing that product with rivals.

So the useful question is not “Is this source trustworthy?” but “Is it trustworthy enough for what I want to use it for?” The four areas below, authority, purpose, evidence and date, give you a repeatable way to answer.

Authority: who is speaking?

Look for the author and the organization behind the material.

• Is there a named author, and do they have relevant training, experience or a track record on this subject?
• Who published it: a university press, a professional body, a government agency, a news organization, a company, an individual?
• Has the work been reviewed or edited by anyone else? Scholarly journals typically use peer review, in which other experts assess a manuscript before publication, though the rigor of this process varies between journals. Books from established publishers are normally edited, though that does not guarantee accuracy.
• Can you find out more about the author or organization from somewhere other than their own pages?

Missing authorship is not automatically disqualifying, since many reputable reports are issued by organizations rather than individuals. But if you cannot tell who is responsible, you have less to go on and should look for support elsewhere.

Purpose: why does this exist?

Every piece of writing is produced for a reason. Knowing the reason helps you spot what may be emphasized, softened or left out.

• Is the aim to inform, to teach, to persuade, to sell or to entertain?
• Does the source disclose funding, sponsors or affiliations that could influence what it says?
• Is the tone measured or loaded with emotional language?
• Does it acknowledge other views, or present only one side?

A persuasive source is not necessarily wrong. An advocacy group may publish accurate data. But you should read it knowing it has a position, and look for how its claims compare with sources that have different interests. Our discussion of cognitive biases is a reminder that we are also inclined to trust material that confirms what we already believe.

Evidence: what supports the claims?

A source that makes claims without support asks you to take them on trust. Check how it handles evidence.

• Does it name its sources, data or methods so you could check them?
• Do the references actually exist and say what the author claims? Spot-checking one or two is worthwhile.
• Is the reasoning sound? Look out for logical fallacies, such as attacking a person instead of an argument, or treating a single example as proof of a general rule.
• Are statistics put in context, and are charts fair? Misleading charts can distort a modest difference by trimming the axis.
• Does the source treat correlation as if it showed cause? Many articles do, and correlation causation is a common trap.
• Are the conclusions proportionate to the evidence, or do they claim far more than the data can bear?

For research papers, learn to look at the sample, the method and the limitations section. Guidance on reading papers as a non-specialist can help you extract these points without needing expert training.

Date: is it current enough?

How much the date matters depends on the topic. In fast-moving fields, such as technology or medicine, older material may have been overtaken. In history or literary studies, a source from decades ago may still be central, and older material can be a primary source in its own right.

• When was it published, and has it been updated?
• Has the situation changed since then (new research, new laws, new events)?
• If there is no date at all, can you find one from another source, or should you treat the material with extra caution?

Remember that publication date and the date of the underlying data can differ. A 2024 article may rely on a survey carried out years earlier.

Check beyond the page

One of the most effective habits is to stop reading a page in isolation and ask what others say about it. This is the idea behind lateral reading: open new tabs, search for the author or organization, and see how independent sources describe them. That tells you more than the “About” page, which is written by the source itself.

Similarly, check whether important claims are reported by other independent, reputable sources. If a striking claim appears only in one place, treat it cautiously. Broader habits for misinformation spotting and the wider skill of information literacy both build on this idea.

A short checklist

1. Who wrote it, and who published it?
2. Why was it written, and who gains if I believe it?
3. What evidence is given, and can I check it?
4. When was it published, and is that recent enough?
5. What do independent sources say about the author and the claims?

If a source fails several, look for something stronger or use it with a clear caveat, for example “according to the organization’s own report”.

Common pitfalls

• Judging by appearance. A polished design or a “.org” address does not guarantee quality.
• Stopping at the headline. Summaries may overstate what the full text shows.

Evaluation is a matter of judgment rather than a formula, and readers may reach different conclusions about the same source. If you can say why you trust a source for a particular use, and what its limits are, you are evaluating well.