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The Y14.5 Standard has a fundamental rule called Rule #1. You would think that this rule would be thoroughly understood and followed by users of drawings and the Standard. Unfortunately, there are still questions about Rule #1 and its relevance. The most recent question was whether or not Rule #1 applies to a width if one side is designated as a datum feature. The answer is, “Of course.” Just because one side of the feature of size will be used as a datum feature doesn’t mean that the requirement of size is no longer required.