Criteria to prioritise investment projects include economic profitability, reduction of extreme poverty, regional development and concurrence with other investment programmes and projects (CONAGUA, 2008). However, the existing systems seem to support the selection of projects mostly within programmes and within sub-sectors and it is unclear to other stakeholders how the allocation across sub-sectors works. There are several examples of actions taken to reduce costs and increase the efficiency of public spending that could be replicated - such as taking advantage of economies of scale in the provision of water supply and sanitation services (see the benefits from the creation of a inter-municipal companies in Colima) or adopting appropriate technologies (e.g. rainwater harvesting in Oaxaca).