Metrics for comparing three word-based software programs used for augmentative and alternative communication.

The purpose of this investigation was to conduct an analysis of a set of metrics developed for comparing features of software used in speech generating devices (SGD) for augmentative and alternative communication (AAC). These metrics - measures of speed, efficiency, and accuracy - were employed during a sentence reconstruction task. Twenty two participants without disabilities reconstructed nine sentences using each of three SGD software programs, counterbalanced to remove order effects.