The decision-based design community has made impressive progress over the past 20 years. The theory has become better founded. Industrial test-bed applications have grown more sophisticated. The successes and failures of methodologies in the field have informed the research agenda. Our interdisciplinary approach has evolved from that of a dilettante to that of a highly skilled systems analyst—one with a deep understanding of the integration of one or more technical specialties. The most fundamental contribution has been to bring the same mathematical rigor to design decision-making that has long been employed in traditional design analysis, particularly in the areas of...