Discourse analysis is a fundamental concern for the study of human communication, accessible through an analysis of language behavior. A theoretic basis is provided for eight variable classes identified by Syntactic Language Computer Analysis (SLCA-III). Numerous empirical studies support its utility as an indicator of perception and cognition. Issues are raised regarding the role of language research in communication. Emphasis is placed on treatment of language as a behavioral indicator of experience, fluctuating as a barometer of social roles, psychological states, communication disorders, and communication mode.