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The literature on product development continues to grow. This research is varied and vibrant, yet large and fragmented. In this article we first organize the burgeoning product-development literature into three streams of research: product development as rational plan, communication web, and disciplined problem solving. Second, we synthesize research findings into a model of factors affecting the success of product development. This model highlights the distinction between process performance and product effectiveness and the importance of agents, including team members, project leaders, senior management, customers, and suppliers, whose behavior affects these outcomes. Third, we indicate potential paths for future research based on the concepts and links that are missing or not well defined in the model.