This paper reports on a study which examined critical mass for the use of information technologies (i.e., electronic mail and World Wide Web applications) in schools, colleges, and departments of education (SCDEs) by faculty, students, and faculty and students combined. The study also investigated critical mass for the existence of adequate infrastructure for information technologies. A sample survey design was used to collect data from professional teacher education institutions. The 1996 SCDE Technology Survey was mailed to 744 SCDE institutions. Responses were received from 465 institutions for a response rate of 63%. Achievement of critical mass was based on the number of institutions identified as SCDE faculty and student users combined, SCDE faculty users, SCDE student users, and SCDE institutions which provide adequate infrastructure for information technologies. Results confirm critical mass has been reached in SCDE use of information technologies and for the provision of adequate infrastructure for the use of information technologies. Recommendations and implications for other issues associated with technology integration are included. (Contains 23 references.) (Author/DLS)