Yeah, this is why I don't prefer the common "effort vs time" distinction. Instead I like to think of "relative size of task," which is a very easy concept for

Yeah, this is why I don't prefer the common "effort vs time" distinction. Instead I like to think of "relative size of task," which is a very easy concept for most people to intuitively understand. It's fairly easy to guess that a task that is twice as "big" will take twice the "effort" and thus also twice the "time," all else being equal. And it turns out that's all we need in order to estimate the schedule. See the detailed commentary here: http://apenwarr.ca/log/?m=201712#slide19 http://apenwarr.ca/log/?m=201712#slide19