The effectiveness of a constant time-delay procedure to teach chained responses to adolescents with mental retardation.

The team worked with three high-school students who had moderate intellectual disability.

Each teen needed to learn three cooking chains: making a grilled-cheese, cocoa, and gelatin.

The teacher used a 5-second constant time-delay. She showed the picture cue, waited five seconds, then gave a full hand-over-hand prompt if the student did not start the step.

All students mastered every chain in 8–14 teaching sessions.

Accuracy stayed above 85 % when teachers checked three months later.

Two students also did the tasks at home with 80–100 % correct steps, showing the skill traveled to a new kitchen.

Morris et al. (1982) used a shorter 3-second delay to teach picture matching to autistic children. The shorter pause worked for simple choices, but Buskist et al. (1988) shows a longer 5-second window is safe for longer chains with teens who have ID.

Silbaugh et al. (2018) took the same time-delay idea into feeding therapy for preschoolers with autism. Both studies show the delay tool moves across ages and skills.

Nishimura et al. (1987) paired prompts with a DRL schedule to slow down eating in adults with ID. Like Buskist et al. (1988), they found prompting plus a timing rule produced lasting change in daily living skills.

If you run classroom-based instruction, add a 5-second pause before prompting. It is easy to train staff and gives the learner a clear shot at independence on every step. Start with one short chain, track each step, and probe at home or in the cafeteria to be sure the skill sticks.