In several recent studies of social remforcement employmg both adults
(Stevenson & Allen, 1964) and children (Hill, 1965
, Stevenson, 1961, Stevenson & Hill, 1965 as Ss, significant differences have been found among mdividual adults m theur effectiveness as Es In the Stevenson and Allen (1964) study, for example, there were significant differences in the average mitial level of performance of the Ss tested by different Es Further, males who were effective m eliciting a high level of performance from men were effective m elicitmg a high level of performance from women and, similarly, women who were effective with women were also effective with men. The characteristics of effective reinforcmg agents were not readily apparent, for such factors as appearance, pnor expenence, and scores on the MMPI did not seem to play a significant role m determmmg whether the adult would or would not be effective Despite the fact that differences m the performance of Ss tested by different Es have been found m widely divergent types of studies (Kmtz, Delpratto, Mettee, Parsons, & Schappe, 1965), httle information is available concermng the charactenstics that differentiate effective from less effective Es
The present report consists of two studies that were designed to mvestigate whether charactenstics of more effective and less effective £s could be isolated An attempt was made m the for their assistance m the organizabon and conduct of thij study We also wish to express our appreciabon to all of the mdividuals who served as Es and to those who acted as Ss We wish to thank Rosemary Hartup who served as the director in the second study 3 Now at the Umversity of Denver