A comparison of procedures in teaching self-help skills: increasing assistance, time delay, and observational learning.

The team worked with preschoolers who had developmental delays. Each child needed to learn a self-help chain like hand-washing or tooth-brushing.

Kids were taught the same skill two ways. One way used constant time delay: wait three seconds, then give help. The other way used increasing assistance: give more and more help until the child does it.

The adults kept track of how fast each child learned the whole chain. They also watched kids who were just sitting nearby to see if they picked up the skill by watching.

Constant time delay won the race. Children reached the finish line a little faster than with increasing assistance.

The surprise bonus: the children who only watched the lessons also learned the skill. No extra teaching needed.

Olaff et al. (2025) extends this idea to talking. They used the same age group and single-case style, but taught bidirectional naming instead of hand-washing. Their probe-first rule lines up with the quick prompt style seen here.

Lovitt et al. (1970) used teacher attention instead of prompts. Both studies ran single-case designs with preschoolers and raised compliance, showing that simple tactics still work decades apart.

Joyce et al. (1988) watched natural preschool instructions and saw context, not wording, drive compliance. Malagodi et al. (1989) took the next step and tested two prompt styles inside that same classroom context.

Pick constant time delay when you teach dressing, toileting, or snack prep. The three-second wait is easy to remember and shaves trials off acquisition. Seat a peer nearby during teaching; the observer often learns the chain for free, giving you double value for your time.