Key points are not available for this paper at this time.
John G. Nicholls, The Development of the Concepts of Effort and Ability, Perception of Academic Attainment, and the Understanding That Difficult Tasks Require More Ability, Child Development, Vol. 49, No. 3 (Sep., 1978), pp. 800-814
John G. Nicholls (Fri,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: