Software Engineering is a profession dedicated to designing, implementing, and modifying software so that i s of high quality, affordable, maintainable, and fast to build. It is a "systematic approach to the analysis, design, assessment, implementation, test, maintenance and reengineering of software, that is, the application of engineering to software." The term software engineering first appeared in the 1968 NATO Software Engineering Conference, and was meant to provoke thought regarding the perceived "software crisis" at the time. The IEEE Computer Society s Software Engineering Body of Knowledge defines "software engineering" as the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software, and the study of these approaches that is, the application of engineering to software.It is the application of Engineering to software because it integrates significant mathematics, computer science and practices whose origins are in Engineering.-Software Engineering is a profession dedicated to designing, implementing, and modifying software so that it is of high quality, affordable, maintainable, and fast to build. It is a "systematic approach to the analysis, design, assessment, implementation, test, maintenance and reengineering of software, that is, the application of engineering to software." The term software engineering first appeared in the 1968 NATO Software Engineering Conference, and was meant to provoke thought regarding the perceived "software crisis" at the time. The IEEE Computer Society s Software Engineering Body of Knowledge defines "software engineering" as the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software, and the study of these approaches　that is, the application of engineering to software.It is the application of Engineering to software because it integrates significant mathematics, computer science and practices whose origins are in Engineering.