Content validity is defined as the extent to which a measure represents all facets of the given construct.

Content validity is defined as the extent to which a measure represents all facets of the given construct.

• A. The extent to which the measure represents all facets of the given construct
• B. The similarity to other measures
• C. The test's reliability
• D. The test's ability to predict outcomes

Answer: (A)

Content validity asks whether the test items collectively cover all parts of the construct being measured. It’s about whether the instrument includes items that represent every facet of what you’re trying to assess, not just a piece of it. Think of measuring a concept like reading comprehension. A test with strong content validity would include items that span different aspects—such as understanding main ideas, making inferences, identifying details, and recognizing vocabulary—in various genres. If important facets are left out, the measure doesn’t fully represent the construct, even if the items are clear and easy to answer. The other ideas involve different concepts. Similarity to other measures touches on how related this measure is to others that assess the same or related constructs (convergent or criterion-related validity). Reliability concerns consistency of results across occasions or raters. Predictive ability refers to how well the test forecasts future outcomes (predictive validity). These describe other dimensions of validity or reliability, not content validity.

Content validity asks whether the test items collectively cover all parts of the construct being measured. It’s about whether the instrument includes items that represent every facet of what you’re trying to assess, not just a piece of it.

Think of measuring a concept like reading comprehension. A test with strong content validity would include items that span different aspects—such as understanding main ideas, making inferences, identifying details, and recognizing vocabulary—in various genres. If important facets are left out, the measure doesn’t fully represent the construct, even if the items are clear and easy to answer.

The other ideas involve different concepts. Similarity to other measures touches on how related this measure is to others that assess the same or related constructs (convergent or criterion-related validity). Reliability concerns consistency of results across occasions or raters. Predictive ability refers to how well the test forecasts future outcomes (predictive validity). These describe other dimensions of validity or reliability, not content validity.