A concept of co-evolution is argued to complement Integrated Water Resource Management's gap in administrative integration. Co-evolution's complement to Integrated Water Resource Management is explored through issues surrounding joint water management arrangements between the Israelis and Palestinians in the late 1990s and early 21st century. How co-evolution contributes to such a water management approach highlights how we might think about what it means to encourage innovation. Conclusions of the article suggest co-evolution provides the language and description for the changing interactions (...) and political environment and therefore provides a sharper conceptualization for administrative integration. (shrink)