Naamsestraat 69, 3000 Leuven, Belgium, European Commission (BEPA), and CEPR, reinhilde.veugelers@econ.kuleuven.ac.be E mpirical research on complementarity between organizational design decisions has traditionally focused on the question of existence of complementarity. In this paper, we take a broader approach to the issue, combining a "productivity" and an "adoption" approach, while including a search for contextual variables in the firm's strategy that affects complementarity. Analysis of contextual variables is not only interesting per se, but also improves the productivity test for the existence of complementarity. We use our empirical methodology to analyze complementarity between innovation activities: internal research and development (R&D) and external knowledge acquisition. Our results suggest that internal R&D and external knowledge acquisition are complementary innovation activities, but that the degree of complementarity is sensitive to other elements of the firm's strategic environment. We identify reliance on basic R&D-the importance of universities and research centers as an information source for the innovation process-as an important contextual variable affecting complementarity between internal and external innovation activities.

This paper provides some first empirical evidence on the relationship between R&D spillovers and R&D cooperation. The results suggest disentangling different aspects of know-how flows. Firms which rate incoming spillovers more importantly and who can limit outgoing spillovers by a more effective protection of know-how, are more likely to cooperate in R&D. Our analysis also finds that cooperating firms have higher incoming spillovers and higher protection of know-how, indicating that cooperation may serve as a vehicle to manage information flows. Our results thus suggest that on the one hand the information sharing and coordination aspects of incoming spillovers are crucial in understanding cooperation, while on the other hand, protection against outgoing spillovers is important for firms to engage in stable cooperative agreements by reducing free-rider problems. Distinguishing different types of cooperative partners reveals that while managing outgoing spillovers is less critical in alliances with non-commercial research partners than between vertically related partners, the incoming spillovers seem to be more critical in understanding the former type of R&D cooperation.

We explore heterogeneities in the determinants of innovating firms' decisions to engage in R&D cooperation, differentiating between four types of cooperation partners: competitors, suppliers, customers, and universities and research institutes (institutional cooperation). We use two matched waves of the Dutch Community Innovation Survey (in 1996 and 1998) and apply system probit estimation. We find that determinants of R&D cooperation differ significantly across cooperation types. The positive impact of firm size, R&D intensity, and incoming source-specific spillovers is weaker for competitor cooperation, reflecting greater appropriability concerns. Institutional spillovers are more generic in nature and positively impact all cooperation types. The results appear robust to potential simultaneity bias. D

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