ABA Fundamentals

A comparison of the Task Demonstration Model and the Standard Prompting Hierarchy in teaching word identification to persons with moderate retardation.

Karsh et al. (1990) · Research in developmental disabilities 1990
★ The Verdict

Fade stimulus features instead of stacking prompts and you will cut word-learning errors in half for adults with moderate ID.

✓ Read this if BCBAs running reading programs for teens or adults with moderate intellectual disability.
✗ Skip if Those working on non-reading skills or with other disability groups.

01Research in Context

01

What this study did

Researchers compared two ways to teach word reading to adults with moderate intellectual disability. One group learned through the Task Demonstration Model. This method slowly makes the teaching cards look more like real print. The other group used standard least-to-most prompting. Each adult tried both methods in an alternating pattern.

02

What they found

The fading group made about half as many errors. They learned faster. They also read new words better later on. The gains stuck around when researchers checked weeks later.

03

How this fits with other research

Mulder et al. (2020) looked at 28 studies and found stimulus fading keeps winning for learners with ID. The 1990 result lands right in the middle of that long line of success.

Schneider et al. (1967) and Fantino (1968) did the first fading work with kids. They got the same error-cut using simple shape games. G et al. show the trick still works when you move from shapes to real reading words with adults.

Mosk et al. (1984) ran a near-copy design with visual-motor tasks. They also saw stimulus shaping beat traditional prompting on every score. The pattern repeats across tasks and ages.

04

Why it matters

If you teach reading to learners with moderate ID, swap your least-to-most prompts for a fading track. Start with very different cards and slowly shift them toward normal print. You should see fewer errors from day one and better carry-over to new words. One quick change—big payoff.

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→ Action — try this Monday

Make two sets of flashcards: one with extra-large bold print, one normal. Start with the bold set and shrink the font over five lessons.

02At a glance

Intervention
prompting and fading
Design
alternating treatments
Sample size
6
Population
intellectual disability
Finding
positive
Magnitude
medium

03Original abstract

Six persons with moderate mental retardation were taught to identify three words by each of two different procedures. One, the Task Demonstration Model, was a fading procedure which relied on presenting many examples of both the correct and incorrect words while systematically increasing their similarity. The other, the Standard Prompting Hierarchy, is one of the most common procedures for teaching persons with mental retardation, and relied on a least-to-most intrusive prompting hierarchy. Data were presented in three phases and show that the Task Demonstration Model produced fewer errors in (a) acquisition (4% to 14%), (b) generalization (9% to 14%), and (c) maintenance (8% to 14%). Results were discussed in terms of the fading procedure and how the Task Demonstration Model provides a simple means for teachers to improve their students' responding in acquisition, generalization, and maintenance.

Research in developmental disabilities, 1990 · doi:10.1016/0891-4222(90)90025-4