what is the fundamental principles for software engineering

•Some fundamental principles apply to all types of software system, irrespective of the development techniques used:

–Systems should be developed using a managed and understood development process. Of course, different processes are used for different types of software.

–Dependability and performance are important for all types of system.

–Understanding and managing the software specification and requirements (what the software should do) are important.

–Where appropriate, you should reuse software that has already been developed rather than write new software.