In order to complement the theoretical description and make it more
predictive, it would be desirable to estimate the strong and weak
counterterm couplings in the framework of QCD. There presently are some
attempts to dynamically derive the values of these couplings from
`first principles', by means of suitable effective actions representing
moderate-energy QCD, limited to the operators relevant to the strong
interaction 
. Results seem encouraging [33], and
hopefully will lead to an improved theoretical situation, at least in the
strong interaction sector.