In the study reported here, mean scores of the Flexibility and Tolerance for Ambiguity scales of the CPI did not increase significantly following encounter group training. It was found however, that people who sign up for encounter groups are already significantly more flexible than people who do not come to encounter groups. It can be seen then, that the significance of the treatment effect depends more on who goes (volunteers vs. non volunteers) rather than what happens (lecture vs. encounter groups.)
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