How is an operational definition best described?

An operational definition is best described as specifying how a variable will be measured or manipulated. This is a crucial aspect in research methods because it allows researchers to clearly define and quantify elements of their study, enabling others to replicate the experiment or assess the validity of the findings. By providing specific criteria or procedures for measurement, operational definitions ensure that abstract concepts are transformed into measurable terms, which is fundamental for empirical testing and analysis.

For instance, if a study involves measuring "stress," an operational definition might specify using a standardized questionnaire or physiological measures, rather than leaving it open to interpretation. This clarity not only aids in the consistency of the research but also enhances the reliability and credibility of study outcomes, as other researchers can apply the same definitions in their research endeavors.