> 3. Even if they know it's an estimate and not a deadline, they might not know the difference between "40 hours of dedicated effort" and "One week's worth of b

> 3. Even if they know it's an estimate and not a deadline, they might not know the difference between "40 hours of dedicated effort" and "One week's worth of business hours". Making that distinction is just as important as the estimate/deadline distinction. This is the motivation for "story points", to avoid saying "hour" for the former. (And secondarily, let the ratio of the two be discovered by analyzing previous work, in a stable team setting.)