The objective of this research is to know the effect of level interpersonal communication,enviromental knowledge and motivation increasing income which participation people in eternal a tour. Theresearch is done by using survey method to 80 respondents are inhabitants around Danau Toba from 2 (two)district; Simalungun and Samosir, North Sumatera.The results this research are : 1. There is direct effect of interpersonal communication to people’smotivation increasing income; 2. There is direct effect of enviromental knowledge to people’s motivationincreasing income; 3. There is direct effect of interpersonal communication to people’s participation ineternal a tour; 4. There is direct effect of environmental knowledge to people’s participation in eternal ator; 5. There is direct effect of people’s motivation increasing income to people’s participation in eternal atour.Results of this research give implication that people’s participation to eternal a tour is highlydetermined by interpersonal communication, environmental knowledge, and motivation increasing income.
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