This study sought to report the results of a developmental project aimed at the production and evaluation of geographical instructional materials suitable for use on an interactive videodisc system. More specifically, this developmental project involved the development of geographic materials on a videodisc, preparation of a computer assisted instruction (CAI) program on the concept of weather forecasting using these materials, reporting on the process of development, and testing the product with a group drawn from the intended audience. The materials were systematically trialled with a group of 14 undergraduate students, all of whom were enrolled in a social science unit with geography as their major option. Subjects were requested to complete a written pretest. Each subject was then requested to work through the weather forecasting program individually; and to complete the posttests. Each of the pre and posttest consisted of a cognitive test on weather forecasting and a semantic differential scale concerning attitudes towards technologically based learning systems. The posttest also contained another semantic differential scale dealing with attitudes about the videodisc system used in the trial. Finally, subjects were asked to evaluate a CAI program developed in connection with the project.