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Message: [QUOTE="Russ P., post: 3774379"] He says that "no *technology* can solve this kind of problem." First of all, I'm not sure that's true. I think technology *could* have solved the problem -- e.g., Spark Ada, had it been properly applied. But that's beside the point. The point is that the problem had nothing to do with encapsulation. The rocket failed because a conversion was attempted to a data type that could not hold the required value. Am I missing something? I don't see what that has to do with encapsulation. The logic seems to be as follows: 1. Ada enforces data hiding. 2. Ada was used. 2. A major failure occurred. Therefore: Enforced data hiding is useless. If that reasoning is sound, think about what else is useless. [/QUOTE]