Assessment and intervention techniques aimed at developing the individual's ability to use alternate forms of communication ACT's Principles of Assessment and Intervention are quite different from traditional speech-language evaluation and therapy techniques.

ACT believes that appropriate AAC assessment and intervention must take into account the following seven principles: 1) focus on the individual's strengths, not weaknesses; 2) AAC assessment and intervention should be multi modal, since communication is multi modal in nature; 3) focus must be on today and tomorrow; 4) both contextual and specific skills need to be identified; 5) cognitive, linguistic, sensory and motor demands need to be identified and recognized; 6) it is critical to identify and utilize the support systems available to the AAC user, their communication partners, and their facilitators to build communicative competence; and, 7) meaningful communication is a shared responsibility.

All too frequently, AAC assessment and intervention focuses on the individual's ability to "work" the communication system but not on the individual's ability to "use" the system in a functional and effective manner. ACT provides a well-rounded approach by identifying Light's 4 competency areas. These are Operational Competence, Linguistic Competence, Social Competence and Strategic Competence. Without including all four competencies, independent communicative competence cannot be achieved.