This document summarizes key concepts from Chapter 5 of Diffusion of Innovations by Everett Rogers, including: 1. The innovation-decision process consists of 5 stages: knowledge, persuasion, decision, implementation, and confirmation. 2. At the knowledge stage, an individual learns of an innovation's existence. Selective exposure and perception influence what information is attended to. 3. During the persuasion stage, an individual forms attitudes towards the innovation. Interpersonal channels are more important than mass media here. 4. Earliest adopters have shorter innovation-decision periods than later adopters due to greater openness to new ideas.