  We review how a specific resummation of the so-called "delta-expansion",
applied to the QCD Lagrangian, transforms the ordinary perturbative expansion
in $\alpha_s$ into an expansion in an arbitrary mass parameter, around the
basic scale $\bar\Lambda$. When applied to the pole mass, the resulting
expression may be interpreted as a dynamical mass ansatz, to be optimized with
respect to the new expansion (mass) parameter. The construction is generalized
to obtain estimates of the order parameters of the $SU(n_f)_L \times SU(n_f)_R$
($n_f =2,3$) symmetry breakdown.
