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The Premack Principle, also known as the "theory of relative reinforcement," was first proposed by psychologist David Premack in the s. This principle is based on the idea that individuals are more likely to engage in a less preferred behavior if it is followed by a more preferred behavior.

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Documentary movies about Christian missionaries are a great way to learn more about Christianity. They portray many important aspects and stories of the religion in a manner that resonates with a lot of people. In this article, we have listed down some of the best documentaries for you.