Our recommendations on sustainability have developed into a separate area of expertise. This expertise has been developed by making pro-active, concrete proposals towards sustainability within projects. Converting the customer's ambitions into concrete, practical measures or solutions is the first thing we look at in this respect. DGMR has developed its own instrument to tackle this: the GreenCalc+ software package. This package allows us to convert customer's ambitions in the field of sustainability into an environmental index weighing up material use, energy efficiency, water efficiency and mobility. In this way, each project and every adjustment made can be independently assessed.