Assessment techniques regarding language and communication abilities of children with ASD must focus on functional communication and are essential to the assessment of the intervention proposals outcomes. The purpose of this study is to compare the results of two different protocols that assess the functional communicative profile. Participants were 50 children and adolescents with ages between 3 years 9 months and 14 years 8 months of both genders with diagnosis within the ASD. They were assessed by FCP-Rr and FCP-C. The results showed that although both instruments didn’t result in equivalent data, they provided important information about the communication of children and adolescents with ASD because they used the same paradigms of analysis. The comparison of FCP-C and the FCP-Rr results in important information to the comprehensive understanding of children and adolescents with ASD because they use the same paradigms of variable analysis. Results also indicate that disorders in receptive language interfere directly in the interpersonal communication of these subjects while only severe disorders of expressive communication have significant effects on interpersonal communication.