> Estimation of that sort is expensive and you have to have a good reason to take the time to do it. Just wanted to emphasize this sentence. Good estimates ta

> Estimation of that sort is expensive and you have to have a good reason to take the time to do it. Just wanted to emphasize this sentence. Good estimates take time and cost money -- time and money that aren't necessarily worth spending. In many cases you're better off living with order-of-magnitude estimates and spending most of your time doing the actual work -- depending on the nature of the business, of course.