pri_dk, I have to measure the performance of a hundred professionals doing complicated tasks, some similar, and some not, of different ages, life experiences, personalities, inteliigence, energy……

It’s the same in every business. It ain’t perfect, but if you spend time getting it done instead of debating how difficult it is, it really does produce better results. If you get started and don’t like how it’s done, then improve it. Just don’t make excuses for not implementing demanding performance standards for the people who are helping to form our future world.