TheCollected Worksis a landmark resourcethat draws together a lifetime of creative accomplishment. The first twovolumes were devoted to Goedel's publications in full (both in the original andtranslation). This third volume features a wide selection of unpublishedarticles and lecture texts found inGoedel's Nachlass, documentsthat enlarge considerably our appreciation of his scientific and philosophicalthought and add a great deal to our understanding of his motivations.Continuing the format of the earlier volumes, the present volume includesintroductory notes that provide extensive explanatory and historical commentaryon each of the papers, English translations of material originally written inGerman (some transcribed from Gabelsberger shorthand), and a completebibliography.A succeeding volume is to contain a comprehensive selection of Goedel'sscientific correspondence and a complete inventory of his Nachlass. The booksare designed to be accessible and useful to as wide an audience as possiblewithout sacrificing scientific or historical accuracy. The only completeedition available in English, it will be an essential part of the workinglibrary of professionals and students in logic, mathematics, philosophy,history of science, and computer science.