The key decision areas in component engineering are: the material, the tool, the manufacturing process, and the part geometry. These areas and their interconnections are described in relation to the overarching quality criterion of dimensional accuracy in this specialized book by experienced authors. The focus is primarily on the topics of material and tool, while also providing a detailed explanation of tolerance management and the influence of application and manufacturing conditions on the dimensional accuracy of components. Central to all discussions, now in its second edition, is the up-to-date international standard that many sections refer to. A call to component developers is to accept a conceptual separation between functional tolerances (design tolerances) and manufacturing tolerances. Information on the status of GPS standardization is provided, with a particular emphasis on form and location tolerances for plastic components. The authors' own experiences and practical examples are intended to assist readers in grasping the content of the book. The second edition includes all information on the latest international standard, and the project management section has been expanded. Additionally, updates and improvements have been made.