The book first reviews the limitations of program evaluation approaches that pointed to a need for a different way of thinking, one grounded in systems. After defining a system, the book explains how SET is intentionally aligned to evaluate a system's two essential properties: interdependence and emergence. Individual chapters are dedicated to explaining how to execute each SET step. Throughout, the author draws on real-world examples and those from his own evaluations to help bridge the theory-practice divide. The reader is then shown how to use SET to develop actionable recommendations.