where rationality is easily assessed it is already well understood; it is in extending the art to hard-to-assess areas that the material here is most valuable.

My question is : as well understood as it is, how much of it do any single individual here, know, understand, and is able to use on a recurring basis ?

We'll want to develop more than what exists, but we'll build that upon - once we have it - a firm basis. So I wonder, how much knowledge and practice of those well understood parts of rationality, does it require of the would-be builders of the next tier ? Otherwise, we stand the risk, of being so eager as to hurriedly build sky high ivory towers on sand, with untrained hands.