When a technological innovation is introduced, not everyone adopts it at the same moment. Based upon the examination of a large number of studies in innovation adoption, Everett M. Rogers proposed a method of adopter categorization. First, it was observed that the time to adoption follows a curve over time, as shown in this chart:

Roger's bell curve

The process of adoption over time is typically illustrated as a classical normal distribution or "bell curve." The model indicates that the first group of people to use a new technology is called "innovators," followed by "early adopters." Next come the early and late majority, and the last group to eventually adopt a technology are called "laggards."

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