Diagnostic work performed by a Clinical Team signals the beginning of intervention. Based on 6-8 hours of interaction and observations with the child and the Parents, a Diagnostic Treatment Report is generated by the Clinical Team.

Diagnostic Therapy forms the basis for IFSP/IEP goals and shapes beginning treatment plans.

While Diagnostic Therapy allows the Clinical Team to better know each child's limitations, endurance, and strengths, it also helps prepare the child for some of the changes that an intensive in-home program will bring to that child's life.

Diagnostic Therapy also helps establish a relationship with members of the Clinical Team that is useful during the initial stages of training. Instructional Assistants are sometimes introduced into the home and begin working with the child during this period.

The entire Clinical Team, including the Directors, constructs a treatment plan for each child. The plan reflects current levels of communicative intent, verbal and nonverbal cognitive problem solving, functional language, receptive and expressive vocabulary, basic learning repertoires such as imitation, self-help skills, motor development, level of engagement, and any behavioral difficulties.