GLOBAL RENORMALIZATION-GROUP - ART. NO. 016002

The motivation and the challenge in applying the renormalization group for systems with several scaling regimes is briefly outlined. The fou r-dimensional phi(4) model serves as an example where a nontrivial low -energy scaling regime is identified in the vicinity of the spinodal i nstability region. It is pointed out that the effective theory defined in the vicinity of the spinodal instability offers an amplification m echanism, a precursor of the condensation, that can be used to explore nonuniversal forces at high energies. [S0556-2821(98)04911-X].