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The purpose of this study is to get a profile of student's scheme activation based on Theory of Constructive Operators (TCO) in solving a mathematical problem of students with high mathematics ability. The descriptive-explorative method with the qualitative approach is used in this study. The subject is students of grade XI in Science major of SMAN 1 Ponorogo. The data is collected using task-based interview and is validated using time triangulation. Then, it is analyzed using categorization, reduction, explanation, interpretation and conclusion making. The results are: (1) in Understanding Problem: The students do operator C, L, incomplete I, M, and F; (2) in Devising a Plan: they do operator C, L, incomplete I, M, and F; (3) in Carrying Out the Plan: they do operator C, L, I, M, and F; then (4) in Looking Back: they do operator C, L, I, M, and F. Keywords— student’s scheme activation, constructive operators

A Profile of Student's Scheme Activation based on Theory of Constructive Operators in Problem Solving Reviewed from The High Mathematics Ability