This paper discusses the quality criteria that are used in design and science to evaluate the value of the produced knowledge and artifacts. The scientific criteria discussed are: generizability, falsifiability, truth, novelty, parsimony, precision, accuracy and efficiency. Their design counterparts are also discussed. This comparison may help to guide the design method into a more scientific direction. If design is to become a useful research method, then its resulting knowledge must achieve the same or better quality than the traditional scientific method.