This special issue of JTATE is focused on evaluation and research studies conducted under the PT3 program of the U.S. Department of Education. PT3, Preparing Tomorrow's Teachers to Use Technology, is a program designed to ensure that new teachers are prepared to use computers and other technology when they reach the classroom and, in the effort to prepare teachers, that education faculty will be induced to change the content and process of preservice teacher programs. Begun in 1999, the program is a response to the need to improve teacher preparation, recognizing the changing technology environment in K-12 schools. It is, at its core, an effort to develop human resources in education and introduce new technologies to the preparation of new teachers and to the classroom practice of these new teachers in schools across the country.