A case study of Mrs. O illustrates the importance of helping teachers
rethink their disciplinary knowledge as well as their teaching strategies. She
attended several summer workshops that used the mathematics curriculum
Math Their Way (Baratta-Lorton, 1976); the workshops introduced her to
new teaching techniques. After the workshops she saw the transformation
of her practice as complete as she made some changes in her teaching at the
elementary school level that reflected the then-new California mathematics
framework. However, she stopped short of rethinking her knowledge of
mathematics and saw no need for additional education.