This document discusses key concepts and theories of development communication. It defines development communication as using communication to improve socio-economic conditions and quality of life. Theories discussed include modernization theory, which views development as occurring through internal factors like technology adoption; dependency theory, which argues underdevelopment results from relationships with wealthy countries; and the basic needs model, which emphasizes meeting basic needs to enhance welfare. The document also outlines concepts like development communicators, the history and definitions of development communication, and considerations around effective development communication strategies and research.