DescriptionThis book, a collection of 9 recent papers, is a follow-up to Homer's 2012 book, "Models That Matter". The first three chapters were previously published as individual journal articles and are on issues of System Dynamics methodology. The other six chapters have not been previously published. Four describe models developed for clients on health policy issues: hospital-acquired infections, Medicare reimbursement rates, child stunting in the developing world, and Hepatitis C. Another chapter is about human psychology, presenting a model of achievement and satisfaction over the course of an individual's life. The final chapter presents a model of the system dynamics field itself, tracing its historical growth from 1984 to the present and looking to the future.