Question: The four major techniques for gathering diagnostic data are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
The four major techniques for gathering diagnostic data are
a questionnaires, interviews, focus groups, obtrusive measures.
b questionnaires, interviews, observations, obtrusive measures.
c questionnaires, interviews, focus groups, unobtrusive measures.
d questionnaires, interviews, observations, unobtrusive measures.
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