This analyzes final capability into subordinate skills in an order such that the lower levels can be predicted for positive transfer of higher level learning.[5] The lower four orders focus on the behavioral aspects of learning, while the higher four focus on the cognitive aspects.[6] In his original study on instruction, through a study derived from an analysis of learning of a task of constructing formulas for the sums of number series, Gagné attributed individual differences or differences in intelligence in learning.[5]