Models now drive much of the research in climate science, economics, molecular biology, and several other fields in the natural and social sciences. Yet how models work as tools of forecasting, representation, and explanation remains unclear, inviting closer philosophical analysis. In this book, Stephen M. Downes offers the first focused philosophical introduction to scientific modeling, accessible for students and researchers in both philosophy and the sciences. He looks at different models in a wide range of disciplines, suggesting a procrustean view of models is misleading, yet also draws insightful connections between disciplines. Each of the chapters includes a helpful overview, summary, and annotated bibliography.