The document discusses the evolution and adoption of communication technologies over time according to several influential theories. It begins with an overview of the umbrella perspective on communication technology, including its focus on hardware, software, infrastructure and social systems. It then examines Rogers' diffusion of innovations theory and Moore's innovation adoption rate model. The document also summarizes critical mass theory, uses and gratifications theory, media systems dependency theory, and social learning theory. Finally, it provides examples of the theories by analyzing the adoption of smartphones and the development of the Internet.