Technologies in 2001: A Space Odyssey well, such as a nervous breakdown—as Hal did in the film. Clarke noted that, contrary to popular rumor, it was a complete coincidence that each of the letters of Hal's name immediately preceded those of IBM in the alphabet. The meaning of HAL has been given both as "Heuristically programmed ALgorithmic computer" and as "Heuristic ALgorithmic computer". The former appears in Clarke's novel of "2001" and the latter in his sequel novel "2010". In computer science, a heuristic is a programmable procedure not necessarily based on fixed rules, producing informed guesses often using trial-and-error. The results can be false such
Technologies in 2001: A Space Odyssey keeping track of all ideas, shots, and changes and constantly re-evaluating and updating designs, storyboards, and the script itself. To handle all of this...a "control room"...was used to keep track of all progress on the film." Ordway (who worked on designing the station and the five principal space vehicles) has noted that U.S. industry had problems satisfying Kubrick with its equipment suggestions, while design aspects of the vehicles had to be updated often to accommodate rapid screenplay changes, one crew member resigning over an unspecified related issue. Eventually, conflicting ideas of what Kubrick had in mind, what Clarke was writing,