Article InformationAuthors: McGee, G. G., & Daly, T.Year: 2007Publication: Research and Practice for Persons with Severe DisabilitiesVolume: 32Issue: 2Pages: 112-123DOI: 10.2511/rpsd.32.2.112 Final Quality and Data Extraction DecisionsAge: 36-71.9 months (3-5.9 years)Domains: CommunicationSocialIntervention: Naturalistic intervention