Progress in mathematics frequently occurs first by studying particular
examples and then by generalizing the patterns that have been observed
into far-reaching theorems. Similarly, in teaching mathematics one often
employs examples to motivate a general principle or to illustrate its
use. This volume uses the same idea in the context of learning how to
teach: by analyzing particular teaching situations, one can develop
broadly applicable teaching skills useful for the professional
mathematician. These teaching situations are the case studies of the
title. Just as a good mathematician seeks both to understand the details
of a particular problem and to put it in a broader context, the examples
presented here are chosen to offer a serious set of detailed teaching
issues and to afford analysis from a broad perspective. Each case raises
a variety of pedagogical and communication issues that may be explored
either individually or in a group facilitated by a faculty member. The
methodology of case studies is widely used in areas such as business and
law. The consideration of the mathematics cases presented here should
help readers to develop teaching skills for their own classrooms.