This document discusses conceptual foundations of communication theory. It defines communication as the passing of information from one place to another, as well as a social, symbolic, and intentional process. The document also discusses the nature and importance of theory, as well as different traditions and types of scholarship in communication theory, including scientific, humanistic, rhetorical, semiotic, phenomenological, cybernetic, sociopsychological, socio-cultural, and critical traditions. Key aspects of evaluating theory are addressed such as scope, appropriateness, heuristic value, validity, parsimony, and openness.