There is clear evidence of the importance metacognitive skills and motivational aspects in problem solving, thus evaluation is necessary, especially in school context. O'Neil and colleagues made the Trait Thinking Questionnaire, considering the planning and monitoring in the metacognitive dimension, and the effort and self-efficacy in motivational dimension. The present study seeks to adapt and validate a questionnaire for children between 12 and 14 years of age. The instrument meets the criteria for content validity and construct, and with the psychometric properties of items; the reliability of the four components varies between 0.75 and 0.84.