Discussion
Which of the following data-gathering techniques is not used in case study ?
Answer: B
The key's answer is measurement.
A case study gathers detailed information about one person, group or institution by observation, by interview, and by tools such as a personality inventory, along with records and documents. These are named data-gathering techniques. Measurement is the general process of assigning numbers to attributes, which any technique may use, and it is not itself a case-study technique in the way the other three are.
The three named techniques are all used, so each of them is excluded as the answer. I could not find a source that lists techniques not used in case study, and case studies can include tests and measures, so this rests on the key and on elimination.
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