Diffusion of innovation $($DOI$)$ theory, developed by E$.$ M$.$ Rogers in $1962,$ is one of the oldest social science theories. It originated in communication to explain how, over time, an idea of product gains momentum and diffuses $($or spreads$)$ through a specific population or social system. The end result of this diffusion is that people, as part of a social system, adopt a new idea, behavior, or product. Identify the tipping point, the point where a critical mass is developed and momentum is built, in the DOI model.