: The IS development industry is currently undergoing profound changes. The well established, large system developers (hubs) take the lead in establishing partner networks with much smaller, often young companies (spokes). This paper takes the perspective of these spokes and seeks to understand their motivations for entering into such partner networks. Drawing on research of strategic alliances and product complementarities, a theoretical framework on the determinants of partnering is developed. It is argued that partnering is especially attractive for smaller organizations when it allows to access capabilities that would otherwise be difficult to obtain. Three broad categories of dynamic capabilities of hub organizations are assumed to act in this role: the capability to innovate architectures, the capability to provide an integrated enterprise application system, and the capability to address broad markets. These are further analyzed in eight case studies. Each case represents a smal...