Self-Operated Verbal Instructions for People with Intellectual and Visual Disabilities: Using instruction clusters after task acquisition

Three adults with intellectual and visual disabilities were taught vocationally relevant tasks through the use of a self-operated verbal instruction system. During training, the system presented one verbal instruction per task step, individually. After training, the system presented instructions arranged in clusters/groups of two. Data showed that during training all participants achieved percentages of correct task performance exceeding 90. The subsequent use of instruction clusters was effective in maintaining high levels of correct performance for each adult, whereas a deterioration of performance occurred when instructions were not available. Implications of the findings are discussed.