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Szmmary.-Two independent studies are combined and reported here. The Cattell-Curran Psychological State Battery (seven factors) was administered on three occasions to two separate samples. One met for an encounter-group weekend in March and the other in August, 1969. On both occasions the same questions were being asked (1) do anxiety levels fluctuate in a predicted manner during encounter group experiences and ( 2 ) is it possible to detect systematic fluctuations in several, measured psychological states during these experiences? Both questions required a statement of the probability of data over occasions, so the appropriate statistical technique was judged to be analysis of variance for repeated measures. The data did not support the hypothesis that anxiety, as measured, fluctuates systematically during weekend encounter-group experiences. But, there were significant fluctuations in some of the other psychological factors.'The authors wish to thank Professors R. B. Cattell, J. Curran, and J. Wardrop for their advice and assistance.

University of lllinois a~ U r b a n 4 h a t p a i g n University of Texas Medical Branch a; GalvestonSummary.-The purpose of this study was to develop an instnunent which might identify, in more than a global way, persons having attributes of a group facilitator judged effective by both his peers and superiors. A pilot instrument was developed, administered and tested against currently available global rating measures in two independent trials. The factor analysis indicated that three main attributes make independent contributions to the judged effectiveness of an encounter group facilitator: ( a ) generalized interpersonal sensitivity, (b) ability to express spontaneously a full range of emorions and feelings, (c) nondirective leadership style. The scale developed is seen as a useful feedback tool to aid in group-facilitator training, as well as a promising evaluation technique. A finding of this study would Lead one to wonder about the effect of group consensus as a method of rating the effectiveness of group facilitators.