The document discusses a study that explored the relationship between students' approaches to learning and critical thinking abilities. The study administered the Revised Learning Process Questionnaire and Watson-Glaser Critical Thinking Appraisal to 104 high school students. Confirmatory factor analysis showed that both deep and surface learning approaches increased the variance explained in students' critical thinking abilities. Only surface learning approach was significantly correlated with the interpretation subtest of the critical thinking appraisal.