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I once knew a man who was posted as a research scientist at an agricultural institute in what was then British Uganda. He told me with great frustration that he was having extreme difficulty in finding out whether his African assistants had actually carried out the procedures that he had prescribed because they had become so anxious to please their colonial bosses that they always answered 'Yes' to every question asked. He claimed, however, that he had thought of a way around the problem. In the future he would always elicit the same information twice in such a way that the correct answer would be 'Yes' the first time he asked and 'No' the second. It apparently had not occurred to him that if his assistants really always answered 'Yes' to every question, his scheme was doomed to failure.
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