A single-participant multiple probe design across participants was used to evaluate the effectiveness of verbal rehearsal and graduated guidance to teach youth who were blind how to cross the street. This study replicated intervention procedures across settings along with the staggered entry of participants. Individuals learned to cross one or two…

Article discusses research on orientation and mobility (O&M) for individuals with visual impairments, examining constant, variable, and absolute error (descriptive statistics that quantify fundamentally different characteristics of distributions of spatially directed behavior). It illustrates the statistics with examples, noting their…