I don't think that 30% bar is commonly understood. From details in conversations I've had in the past where the reaction to (for instance) a 50% miss was "we c

I don't think that 30% bar is commonly understood. From details in conversations I've had in the past where the reaction to (for instance) a 50% miss was "we can't ever be that bad at estimating again", there's a pervasive attitude that it's a fault in implementation teams that they're not accurate to the day. There's no middle ground: a team that can't give "good enough" estimates is held as incompetent, while the best anyone can ever do would be unacceptable. What's interesting on that specific 50% miss I saw is that the original estimate from the actual teams themselves was argued down as "too big, do it again" by their own management...