Refinement by interpretation in {\pi}-institutions
  The paper discusses the role of interpretations, understood as multifunctions that preserve and reflect logical consequence, as refinement witnesses in the general setting of pi-institutions. This leads to a smooth generalization of the refinement-by-interpretation approach, recently introduced by the authors in more specific contexts. As a second, yet related contribution a basis is provided to build up a refinement calculus of structured specifications in and across arbitrary pi-institutions. 
C\'esar Rodrigues (DI-CCTC, Minho University), Manuel A. Martins (Dep.   Mathematics, Aveiro University), Alexandre Madeira ...
cs.LO