"Precisely Predictable Dirac Observables" is a scholarly book that deals with a modification of Dirac's theory of the electron. The aim of the book is to provide a clear and consistent quantum mechanical treatment that avoids the usual paradoxes. The author, Heinz Otto Cordes, examines the challenges of quantum mechanics in comparison to classical mechanics and highlights the ambiguities that have arisen in the development of various wave functions. The book focuses on the quantum mechanical one-body problem and analyzes different wave equations to promote a better understanding of quantum mechanical concepts. It is aimed at readers interested in the theoretical foundations of quantum mechanics and its applications in modern physics.