In this presentation, Dr. Eisner explains how Cost-Effectiveness Analysis (CEA) can be used by Systems Engineers who are looking for cost-effective solutions. CEA is a proven method for choosing the best answer from a set of alternatives. Dr. Eisner provides a brief look at examples from the military as well as from everyday consumer decisions. He also shows the various solution domains that are recognized explicitly: low cost, low effectiveness, knee-of-the-curve, and high effectiveness, high cost; the role of cost-effectiveness in systems architecting. Dr. Eisner also explains how this approach leans on Rechtin's KISS heuristic.