Exactly knowing where to tap

There is a very old story, often told to fill time during training courses, involving a man trying to fix his broken boiler. Despite his best efforts over many months, he simply can’t mend it. Eventually, he gives up and decides to call in an expert. The engineer arrives, gives one gentle tap on the side of the boiler, and stands back as it springs to life. The engineer presents the man with a bill, and the man argues that he should pay only a small fee as the job took the engineer only a few moments. The engineer quietly explains that the man is not paying for the time he took to tap the boiler but rather the years of experience involved in knowing exactly where to tap. — Excerpt From: Richard Wiseman. “59 Seconds”