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Area of Science:

Augmentative and Alternative Communication (AAC)
Developmental Disabilities
Behavior Analysis

Background:

Selection-based AAC systems are popular for nonvocal individuals with developmental disabilities.
Theoretical and experimental evidence suggests topography-based systems may be easier to learn.

Purpose of the Study:

To review research on the ease of acquisition for topography-based versus selection-based AAC systems.
To examine current practices in AAC system selection and design in relation to theoretical knowledge.
To propose a stimulus equivalence model for guiding AAC training program development.

Main Methods:

Literature review of theoretical and experimental research on AAC system acquisition.
Analysis of current practices in AAC system selection and design.
Proposal of a stimulus equivalence model.

Main Results:

Evidence suggests topography-based communication systems are acquired more easily than selection-based systems.
A gap exists between theoretical knowledge and current practices in AAC system design.
A stimulus equivalence model offers a framework for planning AAC training.

Conclusions:

Topography-based AAC systems may offer advantages in ease of learning for nonvocal individuals with developmental disabilities.
Practitioners should consider theoretical and experimental findings when selecting and designing AAC systems.
The proposed stimulus equivalence model can enhance the effectiveness of AAC training programs.