This book is an introduction to the up-to-date technology used in reducing kinetic mechanisms especially for combustion systems. However, it can also be used as a handbook, in that it presents the most recent methods for modelling a variety of systems. In addition it presents existing software for reducing mechanisms and flame calcualtions for mixed and pre-mixed flames and fuels ranging from hydrogen to propane, and it defines a format for general flamelet libraries. Details are thoroughly compared with experimental data. This volume addresses scientists, graduate students and chemical engineers in industry and environmental research.