What does a research ethics committee actually do?
Reviews research involving people, their data or their tissue before it begins, to assess whether the risks to participants are justified and properly managed — a prior approval requirement, not a review of results.
Why they exist. They were established in response to documented abuses in which research was conducted on people without meaningful consent and with serious harm. The Nuremberg Code, the Declaration of Helsinki and subsequent frameworks established that voluntary informed consent and independent review are preconditions of research on human participants, rather than matters for the researcher's own judgement.
What a committee assesses:
Informed consent — whether participants will understand what they are agreeing to, whether consent is genuinely voluntary, and how it is documented. Particular attention where there is a power imbalance, such as students recruited by their own lecturer or patients by their own clinician.
Risk and benefit, and whether the risk is proportionate to the knowledge to be gained.
Vulnerable participants — children, people lacking capacity, prisoners — where additional safeguards apply.
Data protection, anonymisation, storage, retention and sharing.
Right to withdraw, and what happens to data already collected.
Deception, where the design requires it, and the debriefing plan.
Recruitment and incentives, since payment large enough to override judgement about risk is itself a problem.
Researcher safety, which is frequently overlooked and is part of the review.
What it is not: a judgement on scientific merit, though a study too poorly designed to answer its question is unethical because it wastes participants' time and exposes them to risk for nothing — so the boundary is not absolute.
The structure in the UK: the Health Research Authority oversees NHS research ethics committees for clinical research; universities operate their own committees for other work; and additional approvals apply for human tissue, clinical trials of medicines and animal research.
The common criticisms: that processes are slow and bureaucratic; that they are applied inconsistently; that they are risk-averse in ways that impede low-risk social research; and that they can function as institutional risk management rather than participant protection.