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32.4.2 Program Verification and Simulation

After a program has been written it is important to verify that it works as intended, before it is used in production. In a simple application this might involve running the program on the machine, and looking for improper operation. In a complex application this approach is not suitable. A good approach to software development involves the following steps in approximate order:

1. Structured design -design and write the software to meet a clear set of objectives.
2. Modular testing -small segments of the program can be written, and then tested individually. It is much easier to debug and verify the operation of a small program.
3. Code review -review the code modules for compliance to the design. This should be done by others, but at least you should review your own code.
4. Modular building -the software modules can then be added one at a time, and the system tested again. Any problems that arise can then be attributed to interactions with the new module.
5. Design confirmation -verify that the system works as the design requires.
6. Error proofing -the system can be tested by trying expected and unexpected failures. When doing this testing, irrational things should also be considered. This might include unplugging sensors, jamming actuators, operator errors, etc.
7.

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