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The Hawthorne Effect describes the curious reality that humans under observation usually perform better than those who are unobserved. This means that when designing a case study observation you need to be aware of this effect. But it can be used to your advantage. A PL program consisting only of observation will almost certainly improve teacher practice.
The Hawthorne Effect can also be used to explain why your diet might have worked. The very fact that you are paying attention to your food, rather than eating randomly, may improve the types and amount you are eating.