  We discuss the perturbative running Yang-Mills coupling constant in the
Wilsonian exact renormalization group approach, and compare it to the running
coupling in the more conventional MS-bar scheme. The exact renormalization
group approach corresponds to a particular renormalization scheme, and we
relate explicitly the corresponding Lambda-parameters. The unambiguous
definition of an exact renormalization group scheme requires, however, the use
of a one-loop improved high energy effective action.
