"Starting with the assumption of the psychology of personal constructs that each individual develops and makes use of a set of constructs in attempting to predict and control his environment, the effects of apparent failure in prediction were studied in relation to 2 kinds of construct (constellatory and propositional) differentiated on the basis of their range of interdependency. 3 specific hypotheses were tested and each found experimental support. From these findings, it might be concluded that there is an inverse relationship between the range of inter-dependency of a construct and its susceptibility to change following predictive failure. Several possible implications of these findings are discussed.".