Carried out 2 experiments which obtained a substantial between-Ss set-size effect by employing a more sensitive experimental design than previous studies: a broader range of set sizes was used, more Ss participated, and each S gave multiple estimates of sets of the same size. Ss were 96 undergraduates in Exp I, and 68 in Exp II. Over the set-size range (1-32), the response followed an exponential growth curve guide. Exp II confirmed a reference scale prediction that the magnitude of the set-size effect should diminish over trials. In neither experiment did set size affect confidence judgments. (30 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)