In providing for inservice nursing educational opportunities, the obvious advantages of the computer-assisted instruction (CAI) mobile system are its inherent interactive quality and the flexibility of scheduling made available to those who are already working in a field. The rationale for the development of the system is based on the past and continuing success at Pennsylvania State in retraining inservice teachers via mobile CAI. Preliminary followup evaluation results have shown that teachers find the content useful and the delivery system very adaptable to their needs and would be willing to take additional courses by CAI. It is estimated that a single mobile van can facilitate 1,5000 three-credit course completions annually at a cost of approximately $60 per course or $20 per credit hour for a fully amortized computer and mobile laboratory. (Author/JY)