Blythe, T. (1998). The teaching for understanding guide. San Francisco: Jossey-Bass.
A very practical, teacher-oriented guide to teaching for understanding as developed by David Perkins and his colleagues.

Perkins, D. (1992). Smart schools: From training memories to educating minds. New York: Free Press.
A well-written, engaging, and comprehensive consideration of teaching for understanding.

Wiske, M.S. (Ed.). (1998). Teaching for understanding: Linking research with practice. San Francisco: Jossey-Bass.
A detailed look at teaching for understanding by the participants of the Harvard Teaching for Understanding (TFU) research group. The TFU home page contains information on TFU, examples of TFU projects, tools for designing TFU instruction, and opportunities to communicate with TFU staff. At present, a number of the site's features require registration, and user fees will eventually be levied. The TFU pages are housed at the website of Active Learning Practices for Schools, a Harvard Project Zero resource.