Reliability science: reducing the error rate in your practice.

Consider the following scenario: Every day before work, you stop at a neighborhood coffee shop and order a cup of coffee with cream and no sugar. This scenario repeats itself for years without incident. Then one day, after you drive away with your coffee, you notice that the workers forgot the cream and put in sugar instead. The next day you mention the mistake, and the coffee shop manager apologizes, so you pick up the coffee as usual. Two weeks later the same mistake happens: sugar, no cream. You are mildly annoyed and express your dissatisfaction, so the manager apologizes again and refunds your money. All is well for a