Nowadays, Object-Oriented Technology (OOT) is widely appreciated in every area of computer science not only in academic atmosphere but also in commercial world. Authoring timely and efficient software only is not enough, also, but considering the upgrading, future change and maintenance of the software is becoming the inherent skills necessary for today''s development teams. Some attributes of software quality would tell if the systems can be utilized efficiently in the long run. This calls for the rational assessment and evaluation of the existing systems. Measurement of coupling in collaboration with size measures will make way to estimate the resources such as human resource, time, cost, and machine resources for maintenance and evolution of the existing OO system. In this book, altogether six coupling measures together with eleven size measures are paid focus for the evaluation of the OO systems using statistical methods. The scope of the book is intended for the project managers, the software engineers, academics, practitioners and whoever interested in the development and maintenance of object-oriented software systems.