When a beginning programmer writes a program, there is one goal: the program must work correctly. However, correctness is only a part of what makes a program good. Another, equally important part is that the program be maintainable.
Perhaps you have experienced the frustration of installing a new version of some software, only to discover that its performance has degraded and one of the features you depend on no longer works. Such situations occur when a new feature changes the existing software in ways that other features did not expect.
Good software is intentionally designed so that these ...
