This paper discusses a model of integrated instruction and assessment called SMART (Special Multimedia Arenas for Refining Thinking). SMART involves interactive use of the Internet and multimedia software. The Internet serves three important functions: it acts as a formative assessment tool by providing individualized feedback to students, creates a learning community by displaying data submitted by participating classrooms, and promotes discussion and reflection on important concepts. This paper discusses design features of the SMART model, including the Internet tools, and describes an example from middle-school science. Two figures present an excerpt from the SMART WWWeb macroinvertebrate catalog and an excerpt of student feedback from SMART WWWeb. (Author/DLS)