When designing an object-oriented program, there are several goals to achieve:
The Trellis programming system is an integrated language and environment that provides many of the mechanisms needed to design and implement object-oriented programs. The remainder of this sidebar discusses how Trellis helps attain the goals outlined above.
- The program should accurately model the real-world objects to be represented. This leads to a program that is easier to understand and therefore simpler to maintain.
- Code that implements the model accurately must also be robust. Inconsistent models should be detected at design time, not diagnosed as a run-time error at a customer's installation.
- The programming environment must allow for convenient exploration of the application; it should foster a reuse of existing types of objects, thus reducing the scale of the design. It should also facilitate changes to the program as the application design is updated.
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