This study endeavors to extend research on organizational learning by investigating the complicated effects between exploratory - exploitative learning and new product performance in a single new product project Specifically, premised on contingency theory the authors investigate the negative nonlinear and interaction effects of project-level exploratory and exploitative learning behaviors on product development performance, and examine internal organizational and external environmental factors to recognize their differential moderating effects between the two learning behaviors and new product performance Most of the hypotheses are supported based on questionnaire survey results of 253 new product projects The results indicate that the two type of learning have curvilinear (inverted U-shaped) effects on new product performance, and suggest that product development performance will be enhanced when one learning is at higher level and the other is at lower level Furthermore, the authors discover that process-based reward, encouragement to take risk. and environment dynamics strengthened the benefits of exploratory on new product performance On the other hand, the advantages of exploitative learning on new product performance is further enhanced when output-based reward, project development formalization, and environment competitiveness is high Finally, this study suggests that project managers should pay careful attention to employ the two learning behaviors during new product development (C) 2010 Elsevier Inc All rights reserved