What is an operational definition?

An operational definition is a clear and precise statement that specifies how a variable is measured or identified within the context of a study. This definition allows researchers to quantify abstract concepts into measurable variables, ensuring that variables can be consistently and accurately assessed. For instance, if a study is looking at "stress," the operational definition could specify that stress is measured using a particular psychological questionnaire or physiological measures like cortisol levels.

Having an operational definition is crucial in research because it provides clarity and consistency, allowing for replication of studies and comparisons between different studies. It establishes a basis for understanding and interpreting research findings by clearly defining what is being studied and measured in practical, observable terms.