Copyright © American Speech-Language-Hearing Association From: Single-Subject Experimental Design for Evidence-Based Practice Am J Speech Lang Pathol. 2012;21(4):397-414. doi:10.1044/1058-0360(2012/11-0036) Legend: Percent of intervals with challenging behavior and mands during functional analysis, intervention demonstration, and component analysis. From “A component analysis of functional communication training across three topographies of severe behavior problems,” by Wacker et al., 1990, Journal of Applied Behavior Analysis, 23, p. 424. Copyright 2008 by the Society for the Experimental Analysis of Behavior. Reprinted with permission. Date of download: 10/16/2017 Copyright © American Speech-Language-Hearing Association