The rapid growth of the Internet and intranets supports the infrastructure necessary for computer-based testing (CBT). The parallel growth of sophisticated computer programming and powerful computers offers new possibilities in testing, such as Computerized Adaptive Testing (CAT), where the responses of the subject dictate the nature of the test items to be presented. This article considers research about the comparability of computerized tests to conventional tests, local uses of computerized testing, tests available in online delivery programs, public domain software, authoring languages, and commercial and shareware options. The article concludes with a discussion of formative assessment and how computerized tests may be used to meet daily instructional needs.