This study evaluated the design and effectiveness of an interactive videodisc package which was developed at the Open University for a second level course in metallurgy and materials technology. Based on an existing 25-minute television program from the course, the disk put the problem in the form of a court case assessing the responsibility for blindness in teddy bears; whether it was the fault of the manufacturers of the teddy bears' eyes, or the people who made the washers that held the eyes in place. The methods used to evaluate were observation, interviews, and questionnaires; a total of 40 students were observed while using the instruction, 9 students were interviewed after finishing the package, and 20 completed the post-instruction questionnaire. Observation and questionnaire data showed that, on the average, students used the package twice, with a range of from one to six times. Students liked the format, i.e., the continual interrogation and the variation in presentation. Design features that made the videodisc educationally useful were identified as: (1) it made students think; (2) it provided feedback that guided students toward the right answer; (3) it helped students relate theory to practice; (4) it gave students some control over surrogate experiments; (5) it promoted academic discussions; and (6) it focused attention on the subject matter for long periods. The two main aspects of the design package that created problems for students were the open-ended question format and the linear structure of the interaction and information. Costs of developing the package and an eight-point summary conclude this report. (JB)