Mr. Kirsch, a professor of strategy and entrepreneurship at the University of Maryland, saw a way to ensure that the next generation of entrepreneurs could avoid the problems of that bubble, or “at least make new mistakes”: He would document what did and didn’t work during the flurry of business activity around the new technology called the Internet.

In June of that year, he started the Digital Archive of the Birth of the Dot Com Era, usually called the Dot Com Archive (dotcomarchive.org). Shortly thereafter, a partner of a venture capital firm that was closing its doors donated every business plan that the firm had received from 1999 to 2002 — documents covering some 1,100 companies.