This is a complete examination of the theory and methods of modern olefin metathesis, one of the most widely used chemical reactions in research and industry. • Provides basic information for non-specialists, while also explaining the latest trends and advancements in the field to experts • Discusses the various types of metathesis reactions, including CM, RCM, enyne metathesis, ROMP, and tandem processes, as well as their common applications • Outlines the tools of the trade-from the important classes of active metal complexes to optimal reaction conditions-and suggests practical solutions for common reaction problems • Includes tables with structures of commercial catalysts, and recommendations for commercial catalyst suppliers.