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In page Thematic interpretation:

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Thematic interpretation is an approach to heritage interpretation originally advocated by Professor William J. Lewis (University of Vermont)[1] and subsequently developed by Professor Sam H. Ham (University of Idaho). In the thematic approach, an interpreter relies on a central theme (i.e., a major point or message) to guide development of a communication activity or device. In presenting the activity or device, the thematic interpreter develops the theme in such a way that it will be highly relevant to an audience. According to studies[citation needed], presenting a strongly relevant theme greatly increases the likelihood an interpreter will succeed in provoking an audience to think about theme-related issues.