How broadly will computers be used in PK-12 teaching? Reform efforts have often succeeded in getting many teachers to experiment in modest ways with some aspects of those reforms, although often only temporarily, and have also provided some stellar and enduring examples of transformed teaching (e.g., Dunn, 2000). However, in a century of American educational reforms, "we can produce few, if any, examples of large numbers of teachers engaging in these practices in large-scale institutions designed to deliver education to most children" (Elmore, 1996, p. 308).