What mineral assemblages develop during progressive metamorphism of pelitic protoliths along various P-T-t paths? 2. How can we keep track of the equilibrium mineral assemblages and isograd reactions for a variety of bulk compositions by addressing both discontinuous and continuous reactions? 3. How does progressive metamorphism of pelites differ at high P/T, medium P/T, and low P/T? 4. What occurs at very high grades involving partial melting and migmatites