This book provides a thorough introduction to modeling by teaching readers how to build and use a wide range of models, including those for biological, physical, social, and economic systems. Many examples of theory and applications from the modeling community have been added to this second edition, including examples from population models, genetics, disease, economics, and engineering. All models and a run-time version of the STELLA software are included on the cross-platform CD-ROM. The book uses STELLA software to develop simulation models, thus allowing readers to convert their understanding of a phenomenon to a computer model, and then run it to yield the inevitable dynamic consequences built into the structure. Part I provides an introduction to modeling dynamic systems, while Part II offers general modeling methods. Parts III through VIII then apply these methods to model real-world phenomena from chemistry, genetics, ecology, economics, and engineering. Dynamic Modeling includes STELLA run-time software for both Windows and Mac systems, as well as computer files of sample models used in the book. A clear, approachable introduction to the modeling process, of interest in any field where real problems can be illuminated by computer simulation.