The main purpose of this project aims to develop the assessment tool of applying critical thinking on problem-solving for college students. Associated with the other two sub-projects which related to the item design of solving problems, reasoning skills and to evaluate the reliability and validity of the core competence assessment tool. The specific research tasks include 1. Developing an assessment tool of applying critical thinking on problem-solving, including (1) identify the pattern of critical thinking abilities on problem solving, (2) invite the experts to designing and reviewing the items. (3) conduct the pilot test and modify the assessment tool.