  The need for highly qualified physics teachers in the U.S. is well
established, and reform efforts are underway to develop novel and innovative
teacher professional development experiences to improve the quality of K-12
physics education. Streamline to Mastery is an NSF-funded, learner-centered
professional development program that seeks to capitalize on teachers'
knowledge and experience to move physics teachers toward mastery in their
fields. Teacher participants in this teacher-driven program choose their own
goals and areas of growth. One of these areas has been the development and
implementation of inquiry-oriented curriculum, as well as the adaptation of
traditional lessons toward a greater inquiry orientation. Results indicate that
teachers' conceptions of inquiry teaching and learning have become more
expert-like as they have engaged in teacher participant-driven experiences in
the pursuit of greater understanding and more effective classroom practice.
