Yes. So you can more accurately estimate replicating components you’ve written before, eg another database client, but estimating new software is a successive s

Yes. So you can more accurately estimate replicating components you’ve written before, eg another database client, but estimating new software is a successive sequence of uncertainty reduction. The first pass being highly intuitive, the second pass, with more of the details worked out, less so... until you’ve completed the first working version, and you can finally say in hindsight, it actually took this long.