ABA Fundamentals

A conceptual analysis of request teaching procedures for individuals with severely limited verbal repertoires.

Brady et al. (1995) · The Analysis of verbal behavior 1995
★ The Verdict

Plan how you will fade prompts and test new places the very first day you teach a request.

✓ Read this if BCBAs writing mand programs for kids or adults who speak little or not at all.
✗ Skip if Practitioners only running fluent-speaker interventions.

01Research in Context

01

What this study did

The authors looked at every published way to teach requests to people who speak little or not at all. They did not run new kids; they lined up the methods on paper. They asked: what parts of each method make the child want to ask, what extra cues are given, and what happens after the ask?

02

What they found

All methods can work, but they load different amounts of 'extra stuff' like prompts, models, or toys. If you do not plan how to pull that extra stuff away, the ask may stay stuck at the table and never show up at home. You must control the child's drive for the item and the payoff they get, then test in new places.

03

How this fits with other research

Taylor et al. (1993) showed the idea in action: five kids with profound ID learned true asking because the team ran quick 'wrong-item' checks and fixed mistakes on the spot. The 1995 paper explains why that step matters.

Mason et al. (2019) later gave us the SCoRE metric so you can count how much mand, tact, echoic, etc. a child uses after you follow the 1995 plan.

Bao et al. (2017) review of 16 years of autism mand studies backs the same point: most teams teach mands first, but few plan the fade-out; the 1995 warning still applies.

04

Why it matters

Next time you write a mand program, list the 'extra stuff' you add and when you will remove each piece. Build in generalization probes from day one. If the learner takes the wrong item, run a quick correction like Taylor et al. (1993) and track the balance with SCoRE. Your kid's requests will travel with them, not just live at the clinic table.

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Add one probe trial with the wrong item after every five correct requests; if they accept it, run a 3-step correction and try again.

02At a glance

Intervention
verbal behavior intervention
Design
theoretical
Population
developmental delay
Finding
not reported

03Original abstract

There have been many published reports of attempts to teach requests to individuals with severely limited verbal repertoires associated with developmental disabilities. Few of these studies used Skinner's (1975) term mand to refer to the behavior taught, yet many seemed to be influenced by Skinner's analysis. We analyzed procedures according to three variables: motivational conditions, supplemental stimulation, and consequences. Individuals with severely limited verbal repertoires provide unique opportunities to study how each of these three variables influence the acquisition of requests. Our analysis indicated that several different procedures were effective in teaching requests, however the degree of supplemental stimulation for the requests varied greatly. Future request teaching programs should consider how each of these three variables influences targeted responses as well as how these variables influence generalization from teaching contexts to nonteaching contexts.

The Analysis of verbal behavior, 1995 · doi:10.1007/BF03392896