“…In some instances, the key focus centred on associated impairments that frequently present in addition to severe communication impairment -for example, learning disabilities (Cregan, 1993;Hamilton & Snell, 1993;Hinderscheit & Reichle, 1987;Reichle, Dettling, Drager, & Leiter, 2000) or sensory impairments (Cohen & Light, 2000;Dyches, Davis, Lucido, & Young, 2002). In other cases, where participants' ages ranged across the life span (Costello, 2000;Culp, Ambrosi, Berniger, & Mitchell, 1986;Jinks & Sinteff, 1994; Kelford-Smith, Thurston, Light, Parnes, & O'Keefe, 1989;Lanspa, Wood, & Beukelman, 1997), results were discussed on the basis of classification of participants into one of two groups: children or adults.…”