Integration tests for procedural software can be designed using a black
	or white box approach. Both are recommended. Some unit tests can be
	reused. Since many errors occur at module interfaces, test designers need
	to focus on exercising all input/output parameter pairs, and all calling
	relationships. The tester needs to insure the parameters are of the correct
	type and in the correct order. The author has had the personal experience
	of spending many hours trying to locate a fault that was due to an incorrect
ordering of parameters in the calling routine. The tester must also
	insure that once the parameters are passed to a routine they are used
	correctly. 
	 
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