To be precise, innovator theory, but chasm is probably better known around the world.
Diffusion of innovations - Wikipedia
innovator theory
By the way, people who use the "for some reason the classification was determined and the percentage of those people was checked and it was a percentage" way of explaining things like "there are 16% laggards" are the ones who don't understand it properly.
Correct, "defined the bottom 16% as laggards."
Some people assume that 16%, a "number that doesn't look close enough" has some deeper meaning, but it is simply a normal distribution cut off by an integer multiple of the standard deviation that is close enough.
Later in the book "chasm" it is claimed that "the chasm between early adopters and early majority is deep
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