It is recognised by society that freshwater resources play a major role in economic development and in maintaining life supporting ecosystems services. Transboundary river basins cover about 45% of the earth’s land surface and their governance is therefore of critical importance. Transboundary freshwater resources are considered a common-pool resource. Collective action is therefore needed in order to supply both public and private goods from these resources but is yet in short supply. This thesis intends to analyse a complementary framework to the common Integrated Water Resources Management (IWRM) approach with the objective of enhancing investments in collective action to address this dilemma. Results indicate that transboundary water resources management in itself can be identified as a regional public good. The results also indicate that IWRM has been promoted as a standard management concept; often without first having identified and agreed the objectives of the intended multiple uses of water. Outcomes related to IWRM at the transboundary scale are therefore difficult to identify and evidence points towards continued water quality degradation at a global scale and development opportunities not achieved. Two different tools for how to assess the generation of benefits from cooperation are presented in this thesis including an institutional assessment framework adapted to transboundary institutions. Together these steps make up an outcome-driven approach that clarifies the value of water in all management and development stages. Through such an outcome-driven approach, water issues can provide the incentives necessary in order to identify cooperative paths and thus become important factors in negotiations to establish effective regional governance regimes. This would take the broader political, economic and geographical context into consideration thus supporting a process towards more integration of interests between countries.