Three children (ages 10-13) with moderate mental retardation were taught, in a triad, to perform chained snack preparation tasks, with each student being directly taught one task and the other two observing. Results indicated that each student learned the skill taught directly and nearly all of the steps of the chains observed. (Author/JDD)

Co-workers of three job trainees with mental retardation used coincidental training procedures while completing their own jobs. Coincidental training resulted in improved accuracy of salad-making skills, but skill acquisition was very slow; subsequently, a model and a quality-control check were added, resulting in higher performance levels. (JDD)