Describes a study designed to assess the effectiveness of 2 science simulation programs for 11- and 12-year-olds in a developing country (Guyana). Computer-assisted learning (CAL) results are compared with results from written assignments, effect size is discussed, gender differences are examined, and ability levels are considered. (14 references)…

Describes study that compared the attainment gains of Guyanan secondary school children in science and geography following two different learning regimes, i.e., systematically designed learning materials, and conventional teaching. Implications of the results for curriculum design and teacher training are discussed. (Author/LRW)