This document discusses ecosystems and how they differ from traditional networks. It defines an ecosystem as a network of organizations and individuals that co-evolve their capabilities to create additional value or improve efficiency. The key differences discussed are that in an ecosystem partners optimize the entire ecosystem rather than just themselves, there is co-evolution of capabilities between partners, and alignment with partners is at the core of strategy rather than just a firm's own competitive advantage. The document also discusses design questions for ecosystems, such as who does what and how open the ecosystem is. It provides examples of an ecosystem manager's role versus an alliance manager's more limited role. Finally, it discusses challenges in managing ecosystems and the importance of design and influence over direct control.