Design and evaluation in the early phases of the design process some problems and a solution

This contribution contains the description of a design and evaluation system which is formulated for the early phases in the building design process. These phases include the conceptual and the preliminary design steps. The design system is based on the idea that the evaluation should be performed on the same kind of data throughout the design process. That means that as the decisions about a number of attributes of the design are not yet taken, the system automatically provides the default values for those attributes.