Continuing the discussion on the efficacy of DTT and naturalistic language treatment with preschoolers presenting with severe autism, minimal speech (Paul, Campbell, Gilbert & Tsiouri, 2013). Paul, Campbell, Gilbert & Tsiouri (2013) contended DTT over the other approaches used had facilitated in the development of early receptive and expressive language. Paul, Campbell, Gilbert & Tsiouri (2013), had the criticism of DTT as having trouble maintaining and generalizing the gains