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22 n the right circumstances, new technologies adopted by members of a community will spread by diffusion. One of the most robust findings about innovation diffusion is that shifts from one technology or product to another follow a sigmoid, or cumulative normal, distribution.1–3 Thus, the rate of adoption usually starts low, accelerates until about 50(More)
Would a school system allow a person with only an eight-grade education to become an English teacher? Would a self-taught math teacher be given full responsibility for the high school math program? The answers to these questions are obvious to everyone: to become a subject-matter specialist school teacher, one must demonstrate competency by fulfilling state(More)
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