Most companies employ change classes on their engineering change documents to indicate whether the changes are major (affecting form, fit, or function) or minor (eg, typos). My experience is that Class I indicates major changes and Class II, minor. However, I don't know of a reference that defines this common practice. I've checked MIL-STD-100 and ASME Y14.100, but I didn't see it defined in either. Is there such a reference?
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