The truth of sustainable design is that approximately 80% of the design decisions that influence a building's energy performance are made by the architect in the early design phase; the remaining 20% are made by engineers at the later phases of design. Therefore it is crucially important for architects to be able to utilise a quick and reliable energy performance evaluation at the very early stage of the building design process. Using GRAPHISOFT EcoDesigner architects can easily analyze, at an early stage, their design for energy efficiency. Providing invaluable feedback on the building's energy performance means the architect can make better decisions on how to conform to regulations and satisfy the interests of the client and the operator of the building. Ultimately, with energy efficiency we all win!