Computer Science and Engineering, Department of


Date of this Version



Karakashian, Woodward, Choueiry, Prestwhich & Freuder in Proceedings of the International Workshop on Symmetry in Constraint Satisfaction Problems (SymCon '10). Pages 1-18. Copyright 2010, SymCon. Used by permission.


Substitutability, interchangeability and related concepts in Constraint Programming were introduced approximately twenty years ago and have given rise to considerable subsequent research. We survey this work, classify, and relate the different concepts, and indicate directions for future work, in particular with respect to making connections with research into symmetry breaking. This paper is a condensed version of a larger work in progress.