It is true that John is using extinction to change Edgar's behavior.
He is making his behavior of constantly telling jokes 'extinct' by letting his colleagues know that they shouldn't encourage him to continue behaving the way he is behaving. Thus, eventually, given that he is no longer 'rewarded' with his colleagues' laughter, he will completely change his behavior and stop joking around when it's not appropriate.
To answer your question, structural interviewing is a kind of quantitative research method that is commonly used in survey research. This approach or method is to guarantee that all interviews that are presented have the exact same questions in order.
A technological improvement.
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