A two-year investigation into the development of computer-assisted instruction (CAI) for the improvement of undergraduate training in statistics was undertaken. The first year was largely devoted to designing PLANIT (Programming LANguage for Interactive Teaching) which reduces, or completely eliminates, the need an author of CAI lessons would otherwise have for professional programing assistance. Four lessons were constructed with PLANIT and presented in the second year to 21 undergraduates on two California campuses. Each student received four to five hours of instruction including PLANIT communication procedures and conventions, elementary probability, descriptive statistics, and computer programing. It was concluded that CAI is best employed in the numerical demonstration of statistical concepts and for statistical laboratory exercise instruction. Now, and for some years to come, only the more routine aspects of tutorial assistance can be provided with CAI; however, this assistance should be beneficial to both students and instructors. Documentation is provided. (GO)