Results of two studies suggested that acquisition of route mapping during the preschool years provides a means of organizing spatial information and internal representations necessary for successful problem solving in general. (Author/RH)

Tested understanding of correspondence on the part of 2.5- to 3.5-year olds who watched a toy hidden in a model and tried to find an analogous toy in a room. Retrieval scores increased with increasing model-room similarity; were higher for older than younger children; and were affected by object and size similarity. (BC)