The process of adopting new innovations has been studied for over 30 years, and one of the most popular adoption models is described by Rogers in his book, "Diffusion of Innovations" (Sherry & Gibson, 2002). Much research from a broad variety of disciplines has used the model as a framework. Dooley (1999) and Stuart (2000) mentioned several of these disciplines as political science, public health, communications, history, economics, technology, and education, and defined Rogers' theory as a widely used theoretical framework in the area of technology diffusion and adoption. In this paper the author presents the: Four Main Elements in the Diffusion of Innovations, The Innovation-Decision Process, Attributes of Innovations and Rate of Adoption, Adopter Categories, and Technology-Related Studies based on Rogers' Theory.