Reported in this document are the results of a longitudinal study tracing the achievement of nearly 400 students enrolled in the Early Childhood Education Center (ECEC) program for prekindergarten and kindergarten children (from 1976-77 through 1978-79). Progress of these students and their contemporaries was measured by the Portland Public…

Describes typical student strategies for counting cubes in cube buildings and explains why these problems are difficult for students. Suggests instructional tasks that can help students develop more powerful ways of thinking about such problems. Lists two action research ideas related to this issue. (ASK)