“…This deficit reduces the person's ability to express wants and needs, initiate and maintain social interactions, and more generally become socially close to others and connect with others (Atkin & Lorch, 2014;Bretherton & Bates, 1979;Calculator, 1988;Downing & Siegel-Causey, 1988;Light, 1997) In this way, limited speech and language development could be seen as having a significant negative impact upon quality of life (Beukelman & Mirenda, 2005;Schweigert, 2012;Sigafoos et al, 2006;Warren, Yoder, Gazdag, Kim, & Jones, 1993). Communication can be described as an exchange of information from a speaker to one or more listeners to influence their physical or verbal behaviour (Bates & Dick, 2002;Bretherton & Bates, 1979;Keen, Sigafoos & Woodyatt, 2001;Oller, Eilers, Neal, & Schwartz, 1999;Schweigert, 2012;Skinner, 1957). It requires a dyadic relationship between the speaker and the listener and demands that: (a) the communicative message sent from the speaker is able to be recognised as a meaningful or intentional communicative act by the listener, (b) that the listener acknowledges the speakers message, and responds in the appropriate way, and (c) that the desired outcome for the speaker is achieved (Calculator, 1988;Arthur-Kelly et al, 2007;Kaiser & Goetz, 1993;Siegel-Causey, Ernst, & Guess, 1989;Sigafoos et al, 2006;Yoder & Warren, 2001).…”