This work involves both experimental and observational methods and , in accounting for behavior , integrates biological and environmental variables . The relationship of student enthusiasm is derived from `real interest that is when the challenge is neither too easy nor too difficult for an individual 's current cognitive structures . Current directions have their origins in Piaget 's theory of cognitive development and particularly Vygotsky 's later elaborations . A great many determinants influence patterns of educational development and change . In recent times the...











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