How is a valid contract formed? What obligations are established by a contract and by entering into contract negotiations? According to what rules can a party demand performance of the contract, rescind, revoke, or terminate the contract, or hold their counterpart liable for damages? In this volume, Hein Kötz addresses these and other questions of contract law. The second edition has been thoroughly revised. The work was selected as one of the legal educational books of the year 2009. From reviews of the first edition: "The overall impression is undoubtedly impressive: a major achievement!" Gostomzyk/Neureither/Norouzi JuS 2009, p. 1158f. "In addition to the didactic and theoretical accolades that Kötz deserves, the book also has significant merits in system analysis.".