This book describes the cognitive and interpersonal effects of group model building, and presents empirical research on what group model building achieves and how. Further, it proposes an integrated causal mechanism for the effects on participants. There have been multiple previous attempts at explaining the effects of group model building on participants, and this book integrates these various theories for the first time. The causal mechanisms described here suggest a variety of design elements that should be included in group model building practice. For example, practitioners typically try to reduce complexity for clients, to make the process feel more accessible. In contrast, the findings presented here suggest that the very act of muddling through complexity increases participants' affective commitment to the group and the decisions made. The book also describes implications for theory and practice. System dynamics has traditionally been interested in using technical modeling processes to make policy recommendations. Group model building demonstrates that these same techniques also have implications for group decision making as a method for negotiating agreement. The book argues for the value of group model building as a mediating or negotiating tool, rather than merely a positivist tool for technical problems.

New Zealand's deceptively simple but effective program to improve public servicesNew Zealand has long been considered at the forefront of public administration, experimenting with new ways of organizing and delivering public services. Even so, successive New Zealand governments had mixed results from using traditional public management tools to lift the performance of the public service and address persistent problems that required multi-agency action. In 2012 the government decided to try something different. As part of a reform package called Better Public Services, the government challenged the public service to organize itself around achieving just ten results that had proven resistant to previous interventions. The plan was deceptively simple: set ambitious targets and publicly report on progress every six months; hold small groups of public managers collectively responsible; use lead indicators; and learn from both success and failure. This book explores how and why the New Zealand government made progress and how the program was able to create and sustain the commitment of public servants and unleash the creativity of public entrepreneurs. The authors combine case studies based on the experience of people involved in the change, together with public management research. They explain how ambitious targets and public accountability were used as levers to overcome the bureaucratic barriers that impeded public service delivery, and how data, evidence, and innovation were used to change practice. New Zealand experimented, failed, succeeded, and learned from the experience over five years. This New Zealand experience demonstrates that interagency performance targets are a potentially powerful tool for fostering better public services and thus improving social outcomes.