Software Engineering encompasses a process, methods for managing and engineering software and tools. The role of software has undergone significant change over the past half century. From card readers to scanner, from simple equation to artificial intelligence, kilobytes to terabytes, CPU performance from 1 MHz to 6 GHz, 8 bit to 128 bit operating systems. The evolution happened in terms of space, complexity, quality and ease. Legacy applications are attributed with poor quality later with modern applications it’s eradicated. In fact the need for the evolution may even become obvious even before the new system is deployed. With evolving software, the metrics also evolved to measure the quality, not just in terms of documentation but in availability, reliability and robustness of the applications. Process and product measures have been defined to measure the quality of the engineered/developed product.