Conflict and conflict management are critical research issues in client-supplier collaborative new product development (NPD). A recent study found that conflict intensity and conflicthandling styles affect collaborative NPD performance. In this paper, we explore the relationships of four NPD project factors, namely product technical complexity, product certainty, task interdependence and the relative power of supplier, to conflict intensity and suppliers' adoption of integrating and dominating conflict-handling styles. Research findings based on survey data collected from 193 suppliers provide a clear insight into the conflict intensity and suppliers' adoption of conflict-handling styles for NPD projects of various characteristics, which enables better planning for conflict management and helps improve NPD performance.supplier collaboration. Lam and Chin (forthcoming) extended the conflict research in NPD from an intra-organizational to interorganizational level (between organizations). They studied conflict and its management in client-supplier collaborative NPD, and found that conflict intensity and conflict handling styles affect NPD performance. This paper tries to enrich the conflict research in clientsupplier collaborative NPD by empirically exploring the relationships of four NPD project factors, namely product technical complexity, product certainty, task interdependence and the relative power of supplier, to conflict intensity and suppliers' adoption of integrating and dominating conflict handling styles. Identification of these relationships could provide a clear insight into the conflict intensity and suppliers' adoption of conflict handling styles for NPD projects of various characteristics, which enables better planning for conflict management and helps improve NPD performance.