Integrated Water Resources Management (IWRM) has been identified as essential for the management of the Water Sector in Namibia. The original call for IWRM worldwide was made at the World Summit on Sustainable Development (WSSD) held in Johannesburg in 2002, where the international community took an important step towards more sustainable patterns of water management. This call, included in the WSSD Plan of Implementation, was for all countries to "develop integrated water resource management and water efficiency plans, with support to developing countries."