Six persons, ages 17-20, with moderate mental retardation were taught to identify 3 words by each of 2 different procedures--a fading procedure called the Task Demonstration Model and the Standard Prompting Hierarchy. The Task Demonstration Model produced fewer errors in acquisition, generalization, and maintenance. (Author/JDD)

Two time-delay conditions for teaching complex visual discriminations to 14 normal preschoolers, 12 with mild mental retardation, and 11 with moderate mental retardation were compared. Results indicated that for all populations and stimuli, time delay of multiple dynamic distinctive-feature prompts produced learning, while time delay of the single…

The effectiveness and efficiency of stimulus fading, stimulus shaping, time delay, and a feedback only procedure were compared in teaching three adults with moderate developmental delays sight words. Results showed no clear advantage for any one procedure. The benefit of conducting a preliminary evaluation of instructional procedures during…