Re: [scrumdevelopment] Slack Time (was Metrics)
- On 2 May 2006 at 10:08, David H. wrote:
> Personally I always thought that people are off by a certainIn practice, we use a delphi process for doing the estimates. Depending on the spread, we
> "percentage" and not by a fixed factor?
calculate the "error". Typically we add 1/2 a standard deviation to the estimates. It's
spreadsheet magic. It works pretty well, except for larger features, where we can't seem to
estimate right no matter what we do.
--- In email@example.com, mpkirby@... wrote:
It works pretty well, except for larger features, where we can't seem to
> estimate right no matter what we do.
Mike - there are two things that makes my estimating a lot more
accurate. First is to make sure that you never estimate something
that you can't get your arms around. Typically, I say that anything
less than 40 hours is going to be pretty accurate because you can
easily comprehend what it is going to take to do the work. However,
this number will vary depending on the people and the environment.
The second thing that I do is to estimate the accuracy of my estimates
based on the unknowns in the estimating process. It doesn't take long
to master the technique and it doesn't have to be applied to every
estimate. Just those that are larger than you feel comfortable
accepting the risk of missing the estimate by X% (whatever that number
Good estimating to all.