I work in an industry with lots of engineering drawings and what is called redlines. These redlines are corrections to the original drawing. When this happens, most (but not all) engineers will place a "cloud" around the item in question to let viewers know that "this is where the change occurred." Here is the problem, it IS NOT an internationally recongized standard. So what happens when a drawing with clouds falls into the hands of a builder who is unfamiliar with them?
What is the lesson here? That a leader must make sure everyone is aware of the standards, and what they mean.