2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55099Over the last several years, there has been a resurgence of interest in using non-perturbative approximation methods based on Wilson's continuous renormalization group. In this lecture, I review progress particularly in the past year, concentrating on theoretical issues in the structure of the exact renormalization group and its approximations.Invited key talk at NATO Advanced Research Workshop on Theoretical Physics: New Developments in Quantum Field Theory, Zakopane, Poland, 14-20 Jun 1997. 12 pages latex, includes plenum.styHigh Energy Physics - TheoryCondensed MatterHigh Energy Physics - LatticeHigh Energy Physics - Phenomenologytext