This thesis examines the capacity of parents and teachers to accurately report on children's cognitive functioning, and explores the applicability of cognitive constructs contained within CHC theory in obtaining a measure of cognitive functioning via informant-report methods. The current study provides evidence for the capacity of parents and teachers to estimate accurately children's abilities. The data adequately demonstrates the reliability and validity of the newly developed Estimates of

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... ldren's Cognitive Abilities instrument. The results highlight the importance of using strong theoretical models in scale development, and brings us a step closer to developing an effective multi-informant, multi-method measurement of abilities.