New possibilities offered by mobile devices for special education students have led to the design of skill acquisition software applications. Advances in mobile technologies development have made progress possible in helping teachers with autistic students modelling and evaluation. "Chain of Words" theoretical basis is the autism inventory known as IDEA (Inventory of Autism Spectrum Disorders). Our application is based on the functional area of communication. Tests carried out in educational institutions using "Chain of Words" have shown that it is an adequate intervention supporting tool for such deficits. In addition, teacher can customize task contents according to each child's characteristics; thus allowing a more personal intervention within the communication field.