The study investigated the relationships among demographic variables (class grades, school types, major field, parent's education level, etc.), psychological type, thinking style, critical thinking, and creative thinking in senior high school students. The study explored the extent to which students' inclinations and perceived competence to engage in creative thought, as well as their ability to think critically, can be predicted by one aspect of their personality and their psychological preferences. 1119 male senior high school students (grades 10 and 11) participated in the present study. The Thinking Styles Inventory, Chopsticks Creativity Test, Watson-Glaser Critical Thinking Appraisal and Myers-Briggs Type Indicator were administered to the participants. The present study, anchored in Sternberg's theory of mental self-government and Jung's theory of personality types, serves to lend partial support to the evidence of the relationships of thinking styles to personality types. The present findings show the scales across the TSI and MBTI inventories are, in general, related in predictable ways. (Contains 5 tables.)