This method is applied to Water Districts of Central and Western Macedonia, Greece. Results have been published in the Integrated River Basin Management Plans of Western and Central Macedonia Water Districts (WFD Directive) which is a formal legal document, under the Special Secretariat for Water of the Ministry of Environment and Climate Change in Greece, funded by Strategic National Reference Framework 2007-2013 (co-funded by the EU). Estimating the Environmental and Resource Cost in the Water Districts of Western and Central Macedonia: Methods, Results and Proposals for Water Pricing”, Procedia Economics and Finance, Vol. Examples of information systems are provided in Box 5.3.