The "T-cubed: Teacher Teach Thinking" staff development model was developed by teachers, with their colleagues, for their own growth in teaching for effective thinking. The model builds on the cornerstones of the dignity of the teacher, the worth of the individual child, the importance of thorough integration of thinking skills in all subjects at all levels, and a commitment to professional growth. Competence, collegiality, and course of study comprise the dimensions or supporting structure of the model. The dimensions of the model support a working framework of resources, strategies, and applications. Teachers, as well as students, are taught strategies for making meaningful use of knowledge. As teachers consciously focus on tactics for thinking, students begin to take on personal responsibility for their learning; both teachers and students internalize skills which bridge the gap betwen thinking-teaching behaviors and thinking-learning outcomes. Teachers who engage in meaningful staff development, as described in the T-cubed model, not only enhance their teaching but also grow in their own capacity for thinking. (CB)