Yes there's a psychological principle at work there, when you ask a serious of "softball" questions that are intended to get the respondent to agree, blatantly

Yes there's a psychological principle at work there, when you ask a serious of "softball" questions that are intended to get the respondent to agree, blatantly so, the respondent's "radar goes up", so to speak. I've heard someone give this approach -- and its unintended consequence -- a name, but currently it escapes me. And yes, the gentlemen I'm thinking of was in sales, technical sales actually.