“…The criteria for selecting studies were (1) at least five data points per phase (Ferron et al, 2009;Swanson & Sachse-Lee, 2000), (2) at least four baselines (Kazdin & Kopel, 1975), (3) multiple-baseline across-participant designs, (4) full text available for the article, (5) data values that could be clearly read from the graph, (6) an outcome that could be modeled as continuous, and (7) trends within phases that appeared linear. Five studies (from four of the articles) were selected for analysis on the basis of the criteria listed above (Dufrene et al, 2010;Ingersoll & Lalonde, 2010;Koegel, Singh, & Koegel, 2010;Oddo et al, 2010).…”