Feedback refers to client-relevant information that is communicated directly to the client. A review of the literature suggests that how one reacts to feedback is influenced by the kind of feedback, the conditions under which feedback is presented, and a variety of relevant subject variables. The most frequent design has resulted in acceptance of false feedback by college students leading to derogation of instruments and assessors. Honest feedback has led to a variety of positive effects in both research studies and clinical examples. The beginnings of a human science rationale for honest feedback are presented.