Generalized model for the time pattern of the diffusion process

A number of models in different social-science disciplines have been proposed to describe the time pattern of the diffusion process for an innovation. A generalized model is presented of this time pattern; generalized in the sense that it is developed without reference to a specific technical, organizational, or social context. Moreover, models used in marketing, geography, economics, and sociology are shown to be special cases of this model. It provides a useful means for relating and comparing recent and future empirical work in diffusion. The limitations of the model are also examined.