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Causal relationships among academic achievement, self-concept of ability, and general self-esteem were examined for two cohorts of Norwegian school children. Measures of the three variables were collected when the students in the two cohorts were attending third and sixth grade and 18 months later. Four hypotheses were tested by a methodology developed in the frame of structural covariance models with latent variables by means of the LISREL VH program. Support for the assumptions of discriminability and factorial invariance of the concepts across time was obtained independently from estimating structural parameters. The results supported different causal relationships in the two cohorts, suggesting a recursive model at Grades 3 and 4 and a reciprocal model at Grades 6 and 7. The findings strengthened a further need for longitudinal studies examining relationships between academic achievement and self-concept in a developmental perspective. This research was supported by grants from the Norwegian Research Council to Einar M. Skaalvik.We would like to thank two of the anonymous reviewers for very constructive comments. We are also greatly indebted to Hans-

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