Truly sustainable organizations are organizations that have taken sustainability as the starting point of their existence. It is much harder for existing organizations to become sustainable. We have developed a methodology for effective sustainable development and called it the STAR methodology. The STAR Methodology for Sustainable Development is a methodology to structure an organization’s change towards sustainable behaviour. The STAR Methodology can be used to develop organizational sustainability. It contains 5 main process perspectives PREPARE, DEFINE, DEPLOY, REGISTER and REPORT. This methodology has been the foundation for the design of GreenIntelli software.