Civil engineer and historian Petroski interprets the 1940 collapse of the Tacoma Narrows Bridge as a cautionary tale for designers. That bridge failed because engineers made it by enlarging a previously successful idea. Wise designers, Petroski insists, must always contemplate the possibility of failure. Indeed, it is usually failure that spurs designers on toward improved blueprints. Failure-induced improvement may mean merely that lecturers can use a laser pointer in place of a yardstick, but it may also mean that physicians can turn to lifesaving diagnostic software far superior to fallible human protocols. The potential for failure manifests itself before the event to those designers blessed with prescience, but often improvements are only implemented in the wake of actual failures. From ancient Roman engineers dismayed at the failure of stone-arch bridges to twenty-first-century American architects stunned by the collapse of the Twin Towers, designers have frequently learned valuable principles through hard tutelage. Lucid and concise, this study invites nonspecialists to share in the challenge of trial-and-error engineering.
