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Harnick, Frances S. – Child Development, 1978
This study investigated the relationship between task difficulty and ability level as a factor in producing imitative behavior in infants. A total of 28 toddlers, ranging in age from 14 to 28 months, participated in the study. (Author/JMB)
Descriptors: Ability, Difficulty Level, Imitation, Infants

Nicholls, John G. – Child Development, 1978
Selected cognitive developments presumed to mediate the development of achievement motivation are described. Age trends for four causal schemes involving the concepts of effort and ability from 5 to 13 years of age are presented. Developments related to ability, task difficulty, and incentive value are also described. (Author/JMB)
Descriptors: Ability, Age Differences, Attribution Theory, Concept Formation

Nicholls, John G.; Miller, Arden T. – Child Development, 1983
Deals with (1) developmental changes in children's concepts of difficulty and ability and (2) individual differences within different developmental levels. Three levels of understanding of ability and difficulty are proposed, and cross-sectional and longitudinal evidence of progressive development through the stages is presented. (Author/RH)
Descriptors: Ability, Concept Formation, Cross Sectional Studies, Developmental Stages