Abstract
In this paper, I examine the impact of partner technological diversity and alliance organizational form on firm innovative performance. Using a sample of 463 R&D alliances in the telecommunications equipment industry, I find that alliances contribute far more to firm innovation when technological diversity is moderate, rather than low or high. Although this relationship holds irrespective of alliance organization, I find that hierarchical organization, such as an equity joint venture, improves firm benefits from alliances with high levels of technological diversity. Thus, alliance organizational form likely influences partner ability and incentives to share information, which affects performance.