Computer Assisted Instruction (CAI) is, quite simply, an instance in which instructional content activities are delivered via a computer. Many commercially-available software programs, although excellent programs, may not be acceptable for each individual teacher's classroom. One way to insure that software is not only acceptable but also targets a teacher's class in a specific way, is for instructors to design their own software. The HyperCard authoring system is a computer program that enables teachers, even those with minimal programming ability, to easily design their own hypermedia software programs for use in individualized situations. Teachers now have an easy method to teach, drill, remediate, or even test individual classes or students by designing software that targets these classes or individuals. This paper discusses setting up to design or create a software program; designing the software; adding buttons, fields and graphics to the stack/program; and scripting in HyperCard. (Author/AEF)