The adequacy with which a measure's items cover the intended domain of content. Expert review, target-user input and cognitive interviewing can identify missing or irrelevant material. Good numerical fit cannot compensate for a questionnaire that omits essential parts of its intended construct.
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Content validity refers to the extent to which a measurement instrument, such as a test or questionnaire, accurately represents the construct it is intended to measure. It assesses whether the items or questions included in the instrument adequately cover the relevant content domain and whether they reflect the underlying theoretical concept. To establish content validity, experts typically engage in a few key activities: 1. **Defining the Construct**: A clear definition of the construct being measured is critical.