Interactive videodisc training will only come into its own when its effectiveness for improving performance in the workplace is documented through carefully planned and implemented evaluation activities. This paper suggests a model for thorough, fool-proof evaluation to enter each phase of training course production and the rationale for each activity. The evaluation process has been separated into five distinct phases. These phases may not be as clearly differentiated in the production process used by individual companies but the intent is that all activities should be considered in order to tailor the final training product to the needs of the client. These five phases are: (1) Pre-contract; (2) Assessment/Analysis; (3) Design; (4) Development; and (5) Implementation. During the first phase, the client's expectations for evaluation are established and finalized so that a cost base for including evaluation in the overall product development can be established. The second phase is where needs assessment and front-end analysis are conducted. The third phase involves the establishment of the formative evaluation plan, validating the content, and preliminary work for summative evaluation. Evaluation during the fourth phase involves completion of the formative evaluation components in courseware production. The final phase involves the completion of the formative evaluation plan and conducting a summative evaluation. This paper shows that evaluation is not something to be tacked on after a course is developed. It must be woven throughout the entire production process. (9 references) (Author/BBM)