What does it mean if a research study has operational definitions?

Having operational definitions in a research study signifies that each variable has been clearly defined in terms of how it will be measured or manipulated. This clarity allows researchers and readers to understand exactly what is being examined and how it is quantified or qualitatively assessed. Operational definitions help ensure that the study can be replicated and that the results can be reliably interpreted since other researchers can apply the same definitions in their studies.

For instance, if a study involves measuring "stress," an operational definition might specify that stress will be measured using a particular psychological questionnaire or physiological markers like cortisol levels. This precision is crucial because it provides a standardized approach to measurement, thus enhancing the validity and reliability of the research findings.