Once upon a time, I offered cost estimates on a per-feature basis. It didn't take a lot of time for this strategy to bite me. Over the last few years I have est

Once upon a time, I offered cost estimates on a per-feature basis. It didn't take a lot of time for this strategy to bite me. Over the last few years I have established more stable contracts and now I tend to give estimates for larger blocks of work. My estimates per feature are still often wrong, but this risk is mitigated by spreading the estimated effort across a large set of features.