The hard problem is not declaring that the Pareto distribution applies; the hard problem is identifying the critical 80%. If anyone could do that accurately an

The hard problem is not declaring that the Pareto distribution applies; the hard problem is identifying the critical 80%. If anyone could do that accurately and at low cost, all of our problems would be solved. (Often what happens, in my experience, is that the team spends 50% of the cost debating which 80% to implement.)