In Generalizability Theory, if you wanted to figure out how many interviewers would be needed to achieve a level of reliability, what type of study would you need to conduct?

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A Decision Study (D-study) in Generalizability Theory is used to estimate how changes in the design of a measurement procedure (e.g., increasing the number of items, raters, or occasions) would affect the reliability or generalizability of the scores. Therefore, to figure out how many interviewers would be needed to achieve a certain level of reliability, a Decision Study would be conducted.

In Generalizability Theory, If You Wanted to Figure Out How