Its procedures and functions are unsophisticated versions of their final forms, but they allow limited use of the entire program. In particular, it may work for a limited data set. Such sections of code are commented out. The comment brackets can be moved, call by call, as the underlying procedures are actually written. As programs become more complex, changes have a tendency to introduce unexpected effects.
Incremental programming tries to isolate the effect of changes.
We add new features in preference to adding new functions, and add new functions rather than writing new programs. Given an object-oriented design, inheritance, reference, and class attributes are implemented in programming language classes, object interactions are encoded as methods belonging to a selected class, and the permitted sequences of operations are recognized by state machines. From Object-Oriented Development the Fusion Method by Coleman et. Testing A trace of a program consists of a listing of the values of each variable at each point in the execution of the program. It is often difficult to determine what causes a program to fail.