The 80-20 rule in witch I trust is a bit different: any complex enough program takes 20% of the time to get to 80% (that's a working alpha doing most of the thi

The 80-20 rule in witch I trust is a bit different: any complex enough program takes 20% of the time to get to 80% (that's a working alpha doing most of the things it is supposed to do) and 80% of the effort to reach a stable status where it's ready for prime time. Btw the only reason this rule works is because programmers tend to greatly underestimate the time that it takes to do bugs fixing, testing, coverage of corner cases, and so on.