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The Role of Scepticism in Science

Every time a scientist claims to have discovered a new element or a breakthrough medicine, the world does not simply take their word for it. Findings reported by an individual or a group are not accepted as established knowledge until they are rigorously scrutinised by the wider scientific community. Scientists are inherently sceptical of new claims, especially if the results are unexpected or difficult for others to replicate. To "weed out" poorly conceived studies, the scientific community relies on a process called peer review.

The Sequence of Peer Review

When scientists want to share their findings, they must follow a strict, step-by-step sequence before their work is accepted:

Submission: The scientists submit a manuscript detailing their methodology and findings to a scientific journal.
Editorial Review: The journal editors perform an initial check to see if the research is suitable, on-topic, and of sufficient quality.
Peer Evaluation: The manuscript is sent to at least two independent experts (often called referees) who work in the exact same scientific field. These experts must not have been involved in the original research and must have no personal connection to the authors, ensuring there is no bias.
Critical Assessment: The experts scrutinise the work, looking for errors in the data, flaws in the experimental design, and explicitly checking for validity and reproducibility.
Outcome: Based on the experts' reports, the editor makes a final decision. The paper will either be published, returned to the authors for revisions and further experiments, or rejected entirely if the methodology is flawed or the work lacks originality.

What do the Experts Check For?

During their assessment, independent experts are primarily checking two crucial factors:

Validity: This is the extent to which an experiment actually measures what it is intended to measure. Experts check if the method was appropriate and if all key variables were controlled to ensure a "fair test". For example, if a student investigates how temperature affects reaction rate but fails to keep the concentration of the acid constant, the data is not valid because the outcome could be due to concentration changes rather than temperature.

Students often confuse 'accuracy' (how close a result is to the true value) with 'validity' (whether the experimental method was appropriate and a fair test).

When a question asks you to 'Describe' the peer review process, you must provide a sequential account: submission to a journal, evaluation by independent experts, checking for validity/reproducibility, and finally publication or rejection.

Do not use the word 'review' to define peer review in an exam; instead, use terms like 'scrutiny', 'critical assessment', or 'evaluation' of the methodology and data.

You can often secure marks in 'Ideas about Science' questions by explicitly stating that peer review is done 'by other scientists to check the work' and 'to prevent false reporting or poor methodology'.

The evaluation of new scientific claims by independent experts in the same field to ensure the work is valid, original, and of high quality before publication.

The global network of interacting scientists who conduct research, scrutinise each other's work, and establish scientific knowledge.

A publication where peer-reviewed research is shared with the wider scientific community.

Scientists with the necessary expertise who were not involved in the original research and have no personal or professional connection to the author.

A prejudice or conflict of interest that could unfairly influence the evaluation or outcome of scientific research.

The extent to which an experiment and its data measure what they are intended to measure, depending on appropriate methods and properly controlled variables.

The precision obtained when an experiment is repeated by different people, or using different equipment or methods, and yields similar results.

The precision obtained when the same operator repeats an experiment using the exact same equipment and method, and obtains similar results.