The purpose of this study was to examine the impact on students' performance of three contingent feedback strategies used by teachers. Contingency means that the feedback strongly corresponds with task behaviour that can be controlled by the students . Elementary school students (N=296) received individualized feedback about their performance during a series of five lessons . Within this contingent feedback structure. three strategies were applied which were assumed [0 enhance the perceived controllability of the task situation: (1) enhancing the perceptibility of the contingency between feedback and task behavior; (2) explicit reference to effort as part of the feedback. and (3) setting of goals. As predicted, the three contingent feedback strategies had a significant positive effect on perceived controllability, and led to better task performance.It has long been recognized that the feedback teachers give to students influences students' achievement. Depending on whether the feedback is positive or negative, a student may be encouraged or discouraged, sometimes to the point of becoming an underachiever. An important aspect of feedback is the relationship between the judgment and those elements in the task behaviour which are under the student's control, such as effort. When this correspondence is strong, i.e, judgments covary with controllable aspects of the task behaviour, judgments are called contingent. Is it possible to improve the performance of elementary school children by enhancing this contingency of judgments? The purpose of this study was to answer that question .The criterion used by the teacher to judge performance is essential for the degree of contingency. In the case of a group-based evaluation, performance is assessed in relation to other students' performance ; a performance above a specified level (e.g., average) is viewed more positively than a performance below that level. If feedback is individualised , achievement is judged in relation to the student's past performance: improvement results in a positive judgment, deterioration results in a negative or less positive judgment. Intrapersonal comparison of performances instead of interpersonal compari son diminishes differences in abilities and enhances the importance of effort. Consequently, if feedback is individualised, contingency between judgment and task behaviour is stronger.Contingent judgments given to a student are subject to fluctuations depending on the