The Inmates Are Running the Asylum, published in 1998, introduced the use of personas as a practical interaction design tool. Based on the single-chapter discussion in that book, personas rapidly gained popularity in the software industry due to their unusual power and effectiveness. Had personas been developed in the laboratory, the full story of how they came to be would have been published long ago, but since their use developed over many years in both my practice as a software inventor and architectural consultant and the consulting work of Cooper designers, that is not the case. Since Inmates was published, many people have asked for the history of Cooper personas, and here it is.In their book, Fire in the Valley, authors Paul Freiberger and Mike Swaine, credit me with writing the “first serious business software for microcomputers” as far back as 1975. Like so much software of the time, it was terribly hard to use, and its real power was in demonstrating that making s...