Writing and communicating research · Lesson 2 of 3

Methodology and limitations

Methodology must be repeatable and reasoned. Limitations must be specific enough that a reader knows how to use your work.

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These two are the sections readers use to decide how much to trust the rest, and they are the two most often written badly.

A methodology section should let a competent stranger repeat your study. That means: design and why it suits the question; who or what was studied, how they were selected, how many, and who was excluded; what was measured and exactly how; how the data was collected, by whom, when and where; how it was analysed, including decisions made along the way; and ethical approval and consent.

The test is concrete: hand it to someone in your field and ask what they could not work out. Whatever they name is what is missing. The most commonly missing item is the *reasoning* — people describe what they did and never say why it was a sensible way to answer the question, which is the part that makes it methodology rather than a procedure list.

A limitations section is not an apology and not a confession. It is a precise statement of what your work can and cannot support, and it makes the rest more credible rather than less. Write it as: this is the boundary, this is why it exists, and this is what it means for the conclusions.

Two failure modes. The ritual version — "small sample, future research needed" — tells the reader nothing and signals that you have not thought about it. The self-destroying version undermines the work entirely; if a limitation really does invalidate your conclusion, the conclusion needs changing, not hedging.

The good version names the specific boundary, explains its cause, and states its consequence: "Participants were recruited from one organisation, so patterns may reflect that workplace culture; the mechanism we describe should be tested in other settings before being assumed general."

See it happen

Your limitations section reads: "This study has a small sample size. Future research should use larger samples."

The read that arrives on its own

The limitation is acknowledged honestly and briefly, which is what the section is for.

The same situation, with this idea

You ask what a reader learns from it. Nothing: they could see the sample size in the methods. The useful version says which claims the sample supports and which it does not — "with 18 participants from two sites, we can describe the mechanism but cannot estimate how commonly it occurs" — which is specific, checkable, and tells the reader exactly how to use your work.

After this, you can

write a limitation as a boundary on claims rather than as a confession about numbers.

The takeaway

Methodology must be repeatable and reasoned. Limitations must be specific enough that a reader knows how to use your work.

Easy to take the wrong way

That admitting limitations invites criticism. Undeclared limitations invite criticism; declared ones demonstrate you know your own work.

Try this

Give your methodology section to someone in your field and ask what they could not repeat. Write down everything they name.