1. involves within specific historical, social, and cultural context 2. as a rule governed behavior, is described by at least five parameters--phonologic, morphologic, syntactic, semantic, and pragmatic 3. language learning and use are determined by the interaction of biological, cognitive, psychosocial, and environmental factors; and 4. effective use of language for communication requires a broad understanding of human interaction including such associated factors as nonverbal cues, motivation, and social cultural roles.