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The aim of this 18-month longitudinal study was to explore the psychometric properties of the recently developed Working Memory Rating Scale (WMRS) within a general school population of 524 six- to nine-year-old children (259 boys, 265 girls) and with an examination of sex and time differences. Teachers completed the WMRS and children completed objective measures of WM and standardized measures of academic achievement. Confirmatory factor analyses indicated a poor fit for the 20 original WMRS items. Post hoc analyses, however, revealed that the factor structure of an alternative five-item short form was strong for both boys and girls and at the two time points, spanning two consecutive academic years. Internal consistency, criterion-related validity, and convergent validity of this alternative five-item WMRS were also excellent. The short five-item WMRS may …