Which type of validity refers to the degree to which two measures of constructs are actually related?

The type of validity that refers to the degree to which two measures of constructs are actually related is convergent validity. This concept is a critical aspect of construct validity, which encompasses how well a test or instrument measures the theoretical construct it claims to measure.

Convergent validity specifically focuses on the relationship between different measures that are theoretically expected to correlate. For example, if two different assessments are designed to measure the same psychological construct, high convergent validity would suggest that the scores from these assessments are closely related. This relationship enhances the credibility of the measures being used and supports the idea that they are accurately capturing the underlying construct.

In contrast, divergent validity assesses whether measures that are supposed to be unrelated are indeed not correlated, ensuring that the constructs being measured are distinct. Content validity looks at whether a test adequately covers the content area it's supposed to assess. Construct validity encompasses both convergent and divergent validity, thus establishing that the overall assessment accurately measures the intended construct.