In this note we revisit E. Cartan's address at the 1928 International Congr
ess of Mathematicians at Bologna, Italy. The distributions considered here
will be of the same class as those considered by Cartan, a special type whi
ch we call strongly or maximally non-holonomic. We set up the groundwork fo
r using Cartan's method of equivalence (a powerful tool for obtaining invar
iants associated to geometrical objects), to more general non-holonomic dis
tributions.