Twenty-five infants were tested every two weeks on the AB Object Permanence Task, from the time they first reached for a hidden object until they were 12 months old. Results indicate that the AB provides an index of the ability to carry out an intention based on stored information despite a conflicting habitual tendency. (Author/RH)

Errors in naming pictures were studied for 12 children followed from age 15 months to 22 months and for 60 children of similar ages at three different levels of vocabulary development. An increase in naming errors was found with sudden increases in productive vocabulary, suggesting interference from previously retrieved words. (SLD)

This study investigated the rates of successful mathematical performance and errors of information processing in third-grade children in California and continued an investigation of these factors in sixth-grade children. The objectives were to: (1) identify areas of mathematics in which the children had recognizable strengths and weaknesses, (2)…