In order to enhance students' active thinking, faculty members at International University of Health and Welfare developed the CAT (Computer Assisted Thinking) program. The CAT program is different from CAI (Computer Assisted Instruction), which mainly asks users to choose correct answers. Instead, the CAT program asks users to type in short sentences. There are two functions in the CAT program: one is to keep the students' action log each time they use the program and the other is to serve as medical dictionary. An analysis of the action log revealed that the students demonstrated little skill in inferential thinking. Their observations were very concrete. In order to help the students to develop their abstract thinking skills, we need to review our curriculum.