This book presents an extensive verification methodology for proving that reactive systems meet their specifications, expressed as safety properties in the language of temporal logic. The methods include deductive approaches based on theorem proving and fully automatic approaches based on model checking. All researchers and students interested in the analysis and verification of reactive and concurrent systems will find this book to be a comprehensive guide on how formal techniques can be used to ensure the correctness of such systems. An educational version of the Stanford Temporal Prover (STeP), a tool which supports the verification of reactive systems, is available for use with this book.