Mandler (1969) found that one-third of adult subjects were seriators and two-thirds were categorizers in a task where either strategy could be employed. Study 1 was a replication of his procedure with children from Grades 1, 3, 5, 7, and 9. While there was weak evidence that some older subjects chose the categorial strategy, there was little…

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)