Everett Rogers published his major work, Diffusion of Innovation, in 1962 (the most recent version, the Fourth edition, was published in 1995). Currently, he is Regents' Professor at the University of New Mexico in the Department of Communication and Journalism. A graduate of Harvard in Sociology, one of his interests was the adoption of farming technology among farmers. Although his theories are based in sociology, they are highly relevant in a Library setting, and have been applied so in many scholarly journals. Every year there is more and more technology available to not only the librarians, but to the library patrons as well. The theory can be used to interpret the acceptance of new technology in the library. The diffusion theory shows that the way innovation is adopted follows a curve as shown in the chart below:

For those interested in doing an activity which will utilize the terms he uses in his theories, here is a link to a word search done as a student project at another university.