This article describes the results of a needs analysis carried out to determine the requirements of teachers who wish to restructure their classrooms. The article also describes Strategic Teaching Frameworks (STF), a hypermedia computer system that is intended to have a profound impact on professional development for teachers in the United States. STF was designed according to the results of the needs analysis. The needs analysis consisted of interviews with 30 teachers who have changed or are in the process of changing their classrooms. The interviews focused on the nature of the teachers' changes and the tools and resources they used to support those changes. Two of the most important resources are the ability to look at other classrooms and the ability to collaborate with colleagues. The interviews also sought to discover what resources the teachers found lacking; among these are time and financial support.