The study followed up 196 patients of all ages with severe muscular impairment who had been provided with several types of mobility aids (powered wheelchairs, Castor Carts, buggies) over a 3 year period. Of the 138 respondents, 49 were interviewed in their home environment by the evaluation team. A point system was used to quantify the daily use aspects of equipment use, change in life style through equipment use, and reasons for nonuse of the prescribed equipment. Eighty-one percent of the devices were found to be in working condition and 50% of them were being used an average of 9 hours per day at the time of the study. Twenty-two percent of the devices had been outgrown and the average life span per device was 30.0 months. Since the average cost per device was $1,650.00, the cost per day for use of the device through its life span was $1.50. It was concluded that the assistive devices enabled many persons with severe motor impairment to achieve educational and employment opportunities and that the overall cost benefit ratio appeared to be satisfactory. Appended are definitions used in the study, demographic data, equipment pictures, and an assessment form. (Author/DB)