A giant ship engine failed and multiple experts were unable to fix it. An old man in his 80s with decades of experience fixing ships carefully inspected the engine and tapped it with a small hammer, instantly starting it. He billed the owners $10,000 for his work. When they requested an itemized bill, it showed a $2 charge for tapping with the hammer and a $9,998 charge for knowing where to tap.

1. Effectiveness Sharing this interesting article .....from a friend who just retired recently April 2010 He Yan “ Click to go”