Quality is a complex and multifaceted concept that can be described from different perspectives depending on the context peculiarities and the stakeholders. Though measuring quality is not a new theme, asking a developer to measure the quality of a product may generally sound like an unknown or even a new aspect to the software development activities. In this book, an attempt has been made to describe various pertinent aspects of software quality from different points of view. The book has been planned and designed for a one-semester course on 'software quality assurance' as a follow up course on software engineering.