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The changes’ in requirements of users in competition business and economic prosperity leads into the execution of new product development of companies. The aim of new product development is responding the needs of customers, consistency with market conditions, customers’ satisfaction and coping up with competitors’ policies. The purpose of this study was to evaluate the effect and importance of customer involvement in new product development. The conceptual model and hypotheses had been determined according to researcher's studies and observations. In this survey- solidarity and cross sectional sampling were selected for considering the judgment of 150 managers, suppliers; and sellers (wholesalers and retailers) and customers in Yazd tile and ceramic industry. The data has been gathered by a questionnaire and the structural equation modeling (SEM) and partial least squares (PLS).The results showed that the variables Product differentiation, competitor orientation, brand profiling emphasis and internal coordination is significant and positive impact on customer involvement. And relationship customer involvement and new product development is positive and significant; as well as variable market outcomes as a mediator the influence of relationship between customer involvement and new product development.