Research is reviewed on the interaction patterns of individuals using augmentative and alternative communication systems. Major findings and limitations of interaction studies are highlighted, focusing on methodological approaches, subjects, partners, contexts and sampling procedures, and measures and data analyses. Directions for future research…

Validity is a central issue in use of self-report data for the investigation of teacher thinking. "Triangulation," or use of several data sets to test, corroborate and elaborate each other, is one method for increasing validity of findings. This paper illustrates a process of triangulation of data obtained by three different data…