The need for an empirically defensible means of sequencing instruction appears to have been the primary motivator for research into learning hierarchies. Four methods for generating candidates for learning hierarchies were reviewed: introspection, formal analysis, observation, and statistical "fishing." Experimental transfer of training…

Investigates the abilities of 36 fifth graders and 30 ninth graders who were selected from 11 schools in Thailand to solve problems involving seven of Piaget's logical operations. These operations are classification, seriation, logical multiplication, compensation, proportional thinking, probability, and correlational thinking. (HM)