the important degrees of freedom that could be used as the basis for a reduced description of QCD that keeps contact with the microscopics, including central vortices, abelian projections, instantons, and strings. The challenge is to promote such proposals into reliable quantitative tools, or at least to identify some limit in which they become good, systematic approximations.

Alternatively, more directly numerically based approaches might rise to the challenge. The original Wilsonian program of the renormalization group, to integrate up to a coarse lattice, and then solve the coarse lattice theory by other means (presumably, some form of strong coupling expansion) might be revisited in light of the vast increase in knowledge and computer power over the last 25 years.

### Empower Reduced\
Continuum Theories

Extremely useful and important phenomenologies have been constructed using reductions of QCD. They are based in one way or another on integrating out hard degrees of freedom, using asymptotic freedom. The primeval example is the analysis of deep inelastic scattering using the operator product expansion, which reduces what would otherwise be an entirely hopeless problem to the evaluation of a discrete series of low-energy operator matrix elements, or alternatively the structure functions of which they are 