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A math cognitive tutor (MCT) system widely used throughout the US was adapted for use in Chilean public middle schools. The curriculum requires large changes in pedagogy, including the use of computers for individual students to progress through an extended prealgebra program. Students enrolled in schools which adopted the MCT significantly improved their math test scores as compared to control group peers. However, the implementation of the changes in the schools and classrooms was not perfect, and variations in results were observed in different schools. Those schools which were better prepared to make changes, especially those with sufficient computers and technical support services, saw their students master more of the software part of the curriculum. Students, teachers, and principals generally viewed the MCT positively. The results on math performance and attitudes are promising for further …