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This book is designed to give the student a solid foundation in the basic principles that are involved in writing organic mechanisms so that further study may be undertaken with confidence. In Part I, the basic principles that are common to all mechanisms are explained in detail. Some of the exercises may seem very easy, but they are all important, because they instil a precision and discipline that is essential in dealing with more complicated mechanisms. Fluency in writing mechanisms comes from practice, and in particular from recognising when a proposed intermediary is impossible or highly unlikely. In Part II, examples of the main mechanistic pathways are given. No attempt has been made to cover exhaustively all the synthetic routes or reactions that could be encountered by a first year undergraduate. However, by reaching an understanding of why a particular mechanism is followed in any given situation, an appreciation is necessarily developed of the major synthetic methods that may be deployed in producing organic chemicals. There is an emphasis upon understanding the stereochemistry of the interactions between reagents and substrate and the consequences on the geometry of the product, because such an appreciation is of fundamental importance in comprehending an organic mechanism fully. Part III consists of several appendices, which cover all the essential information and simple odds and ends that are often left untaught because it has been erroneously assumed that the student already knows the point in question. There may only be one name on the front cover, but every book is the result of the hard work of many people. First, I gratefully acknowledge the large amount of time and effort that resulted in the invaluable comments made by my