Intended for teachers across grade levels and disciplines, this monograph reviews research on the development of critical thinking skills and introduces a series of these skills that can be incorporated into classroom teaching. Beginning with a definition of critical thinking, the monograph contains two main sections. The first section reviews both research findings and several programs for improving students' thinking skills, and then discusses helping students to remember what they read, improve their problem-solving skills, and adjust to their differing learning styles in acquiring knowledge. The second section presents a number of exercises, for stimulating students' critical thinking, that involve generating questions, imaginative writing, feedback that improves student performance, working in pairs, exploring students' problem solving methods, preparing and sequencing classroom discussions, and generating examples of the terms and concepts encountered in the learning process. The monograph concludes with a list of thinking skills programs. (EL)