Component based software development is becoming quite popular in software development environment and just like object oriented metrics, component based metrics are also essential part of software environment. This study focuses on underlining the compatibility of object oriented metrics and component based metrics. The metrics for object oriented design focus on traditional and subsequent OO metrics which are focused on complexity, lines of code measurements that are applied to the class and design characteristics. These measurements permit designers to access the software early in process, making changes that will reduce complexity and improve the continuing capability of the design. Post design and development phase, the reuse and maintainability metrics help in better analysis and results. This book summarizes the various existing OO metrics, and does an evaluation of corresponding metrics, if any, for component based systems.