In the 1950s, researchers studying how farmers took up new practices used a mix of names for the same groups. Iowa State College's extension researchers, for one, ended their list with “nonadopters.” In 1958 Everett Rogers proposed five names in a paper in Rural Sociology, and they stuck: innovators, early adopters, early majority, late majority and laggards. His 1962 book, “Diffusion of Innovations,” made them famous.
The labels measure one thing: when a person adopts, compared with everyone else. A rollout meeting uses them to answer a different question, which is why.
Rogers later named the problem. His book took on the habit of blaming a person for a problem the system built, which researchers call individual-blame bias. About the group he'd named himself, he wrote in the fifth edition that “it is a mistake to imply that laggards are somehow at fault for being relatively late to adopt.”