Sustainability is of relevance in projects and investments. In project management research the concept of sustainable development receives increasing attention. The relation of sustainable development to the project assignment process and its methods has not yet been researched in depth. The project assignment is important as it essentially lays the basis for the consideration of sustainable development in the investment, initiated by the project. Analysing the investment is one main part of the project assignment process. To have sustainable investments a holistic approach in the project assignment considering sustainability principles, such as economic, social and ecological orientation, is required.