FM's the State of Play with empasis on Climb performance.

[Crumpp]

And more there were some error due the fact there is no guarantee that the pilot used the maximun aircraft performance only because he is human. Was the tests repeated extensively do determine an average that the pilot can climb the aircarft? Yes or no? Due to this the relative (difference in) climbs are in good agreement. Second the quantity represented is not rate of climb.

You are absolutely correct in both your post's Ernest. The Relative performance is about right and it looks like people are nitpicking IMHO.

To put it another way, there is more correct about it than there is wrong with it.

It is rate of climb though. Rate is performance in relation to time. The graph plots are time to altitude which one can calculate rate in feet, meters, inches, nanometers, or whatever unit of distance per time they wish.