Recent studies state that the incidence of autism spectrum disorders is 1% of the infantile population. It implies the need of urgent identification of efficient intervention proposals as well as of the factors that may intervene in these processes. The aim of this study is to describe three years of language therapy processes of three children diagnosed within the autism spectrum with different developmental characteristics and different responses to the therapeutic process. All the children were attending a specialized ambulatory program once a week. The language therapists were post-graduate students in the field and the therapeutic intervention started approximately six months prior to the beginning of the study. The children presented evidence of the diversity of the autism phenotype. Although it was not the purpose of this study, the reference to the three different features of the autism spectrum is clear. This way, the intervention processes received subtle adjustments to each child's specific needs and possibilities. All children had significant progress in their manifestations. The longitudinal individual analysis of therapeutic intervention processes allows the identification of associate process that might be determinant to the results and that demand consistent approaches.