Comment by ozim
3 hours ago
What was the thing you were estimating? R&D?
I think you were estimating time to build things that were out of R&D and you had specifications that were actual specifications you were building up to.
In SaaS my experience is: someone makes up an idea not having any clue how existing software is working or is laid out, has no specifications beside vague not organized bunch of sentences. Software development team basically starts R&D to find out specifications and what is possible - but is expected to deliver final product.
I had the same experience when doing an exercise implementing `mmap` for `xv6` -- that was the last lab. There was no specification except for a test file. Passing that test file is relatively easy and I could game it. I consulted the manpage of `mmap` but it is pretty far from a specification, so eventually I had to write a lot of tests in Linux to figure out what it can do and what it can't do (what happens when I over-mmap? what happens when I write back pass EOF? etc.), and write the same tests for `xv6` so that I could test my implementation. Not sure about hardware, but it is really hard to get a clear specification for software.