The purpose of this experiment was to determine if concept attainment efficiency and strategies were related to adolescent development and method of presenting information. There were 40 Ss at the 12-yr., 14-yr., and 16-yr. levels, respectively, all of average intelligence. 4 groups of 30 Ss, 10 from each age level, solved 6 concept problems. Each group was given a different presentation of
... [Show full abstract] information. The 1st hypothesis was supported. The 14- and 16- year-old Ss were not different from each other and were superior to the 12-year-old Ss on efficiency and strategies. The 2nd hypothesis was not supported. Positive or negative series, transmitting equal information, appeared to have no different effects upon efficiency and strategies. (PsycINFO Database Record (c) 2012 APA, all rights reserved)