Classificiation and mathetics

How to classify the mathetical activities? What is the quality of it?
Recently there is a renewed use of the ideas of Benjamin Bloom.
He suggested in the sixties and seventies of the 20th century a taxonomy.

An improved scheme was presented by one of his fellow researchers, Lorin Anderson. Together with a team of cognitive psychologists he made some significant improvements.
At the beginning of the 21th century it has been usefull in many research already.