Chris Thomale's Leistung als Freiheit is the printed version of his Berlin doctoral thesis of 2011 (Freie Universität) which was supervised by Martin Schwab. The title of the book will most probably be meaningless or even be misleading to non-German readers: Leistung als Freiheit translates to “Performance as Freedom.” The subtitle will not be of any help to non-German readers, either: Erfüllungsautonomie im Bereicherungsrecht means “Autonomy of Performance in the Law of Unjustified Enrichment.” The subtitle points to the area of law to which the book is devoted—the law of unjustified enrichment—and within the law of unjustified enrichment, to those cases which are commonly—and not only in German law—labeled as enrichment by performance or enrichment by deliberate conferral. In German law, and also in other civil law systems, the different condictiones are joined together under this label.