Evidence for acquiescence (yea-saying) in interviews with people who have mental retardation is reviewed and the different ways it has been assessed are discussed. We argue that acquiescence is caused by many factors, each of which is detected differentially by these methods. Evidence on the likely causes of acquiescence is reviewed, and we suggest that although researchers often stress a desire to please or increased submissiveness as the most important factor, acquiescence should also be seen as a response to questions that are too complex, either grammatically or in the type of judgments they request. Strategies to reduce acquiescence in interviews are reviewed and measures that can be taken to increase the inclusiveness of interviews and self-report scales in this population suggested.

Editor in charge: Steven J. Taylor

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