Benoît Combemale, Julien Deantoni, Jeff Gray, Daniel Balasubramanian, Bruno Barroca, Sahar Kokaly, Gergely Mezei, Pieter Van Gorp: Joint Proceedings of the 3rd International Workshop on the Globalization Of Modeling Languages and the 9th International Workshop on Multi-Paradigm Modeling co-located with ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems, GEMOC+MPM@MoDELS 2015, Ottawa, Canada, September 28, 2015. CEUR Workshop Proceedings 1511, CEUR-WS.org 2015