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Jorge Alonso Díaz Porras, of the Colegio Nacional de Educación a Distancia in Costa Rica, studied a teaching strategy built on it. He gave 192 eleventh-grade students at a public school in Costa Rica a diagnostic test on mathematical functions. The students then worked with Smartick and took a final test. He reports that scores rose after the intervention, with Bayes factors that favored higher post-test performance. Boys and girls improved by the same amount, and boys scored higher than girls on the final test. The study had no control group, so teaching between the tests may explain part of the gain. The abstract gives no effect size and does not name the school or say who taught the students. It calls Smartick AI-based without describing its model. 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