What is the purpose of an operational definition?

The purpose of an operational definition is to specify the procedures and measures used to quantify variables in a study. This means that operational definitions provide clarity and precision regarding how a particular variable will be defined and measured within the context of the research. For example, if a researcher is studying "stress," they may operationally define it by specifying a particular questionnaire or physiological measure (like cortisol levels) that will be used to assess stress levels. This clear specification is crucial for ensuring that researchers and readers understand exactly what is being investigated, allowing for replicability and consistency in research. By providing this detailed information, operational definitions help to bridge the gap between abstract concepts and practical measurement, making it easier to evaluate and compare studies within the field.