To Forgive Design Quotes

“That decision falls to scientists, engineers, and managers—with at least the tacit approval of company officers and boards of directors. All complex technology is inseparably coupled to an equally complex team of people and systems of people who should interact with one another as smoothly and with as clear a purpose as a set of well-meshed gears.”
― Henry Petroski, To Forgive Design: Understanding Failure

“Past successes may be inspirational and encouraging, but they are not by themselves reliable indicators of or guides to future success. The most efficacious changes in any system are informed not by successes but by failures. The surest way for the designer of any system to achieve success is to recognize and correct the flaws of predecessor systems, whether they be in building codes or in banking policies or in bridges.25 The history of civilization itself has been one of rises and falls, of successes and failures. Some of these have been of empires, dynasties, families; others have been of nations, states, and cities. Common to all of them has been the human element, embodied in the ruler and the ruled alike. Given that the ultimate unit of civilization is the individual, we need look no further than within ourselves to gain insight into the world and its ways, including the failure of its institutions and its systems. And, just as those institutions and systems are made up of individual people and things, so ultimately must we look to ourselves and to how we interact with the world, both given and made, whenever something goes wrong.”
― Henry Petroski, To Forgive Design: Understanding Failure

“In the early 1980s, managers at the National Aeronautics and Space Administration (NASA) estimated that the flights would be 99.999 percent reliable, which represents a failure rate of only 1 in 100,000. According to the physicist Richard Feynman, who was a member of the commission that investigated the January 1986 Challenger accident, in which the shuttle broke apart shortly into its flight, killing all seven astronauts on board, this “would imply that one could put a Shuttle up each day for 300 years expecting to lose only one.” He wondered, “What is the cause of management’s fantastic faith in the machinery?” Engineers, who were more familiar with the shuttle itself and with machines in general, predicted only a 99 percent success rate, or a failure every 100 launches. A range safety officer, who personally observed test firings during the developmental phase of the rocket motors, expected a failure rate of 1 in 25. The Challenger accident proved that estimate to be the actual failure rate, giving a success rate of 96 percent after exactly 25 launchings.”
― Henry Petroski, To Forgive Design: Understanding Failure

“Some positive persisting fops we know, Who, if once wrong, will needs be always so; But you, with pleasure own your errors past, And make each day a critic on the last. —Alexander Pope, An Essay on Criticism”
― Henry Petroski, To Forgive Design: Understanding Failure