In a waterfall delivery, all progress reports are proxies. You’re reporting on intangibles–designs, test cases, or code that isn’t fully integrated or tested. This is all reporting on faith, because it is not verified by working software.Just this morning this was proven true. A waterfall PM was tracking the progress of some work with a BA who said "I'm waiting on John. He told me that he'd have it ready for me by COB yesterday. In fact he said the same thing last week."
I had a quiet chuckle to myself.