This volume includes the proceedings of the workshops hosted at the ACM/IEEE 21st International Conference on Model Driven Engineering Languages and Systems (MODELS), which took place 14{19 October 2018 in Copenhagen, Denmark. It is a tradition of the MODELS conferences series to host a number of high-quality and interactive workshops during the three days before the main conference. The workshops provide a collaborative forum to exchange recent and/or preliminary results, to conduct intensive discussions on a particular topic related to model-driven software engineering, and to coordinate e orts between representatives of a technical community. They are always a forum for lively discussion of innovative ideas, recent progress, and practical experience on modeldriven engineering for speci c aspects, problems or needs. With 17 accepted workshops out of 20 submitted proposals, MODELS 2018 hosted one of the highest numbers of workshops in its history. We would like to thank all those who contributed to making the MODELS workshops possible. First and foremost, this includes the workshop organizers listed below, as well as the colleagues who served on the many workshop program committees, ensuring the selection of novel and high-quality workshop papers. We also want to acknowledge the work of the conference organization, namely, Andrzej Wasowski, the general chair of MODELS 2018, who worked hard for the conference and helped us substantially with assembling the workshop program. The same holds for Stefan Catalin Stanciulescu, the web chair, and Ahmad Salim Al-Sibahi, the local arrangements chair, who greatly helped us with room planning and managing the website. A special thanks goes to Daniel Struber and O nder Babur, whose excellent and hard work as proceedings chairs was a core prerequisite to creating these proceedings. We would also like to thank the workshop selection committee for their constructive feedback. This year, we strove for a smaller committee, letting members see a larger sample of all workshop proposals submitted. The committee comprised:
{ Sahar Kokaly { Ileana Ober { Alfonso Pierantonio { Jan-Philipp Steghfer { Dalila Tamzalit { Manuel Wimmer
Finally, we would like to acknowledge the team at CEUR who made publishing this volume possible, as well as the EasyChair team, whose software was instrumental in reviewing and selecting the MODELS 2018 workshops.
September 19th, 2018 Regina Hebig and Thorsten Berger Workshops and Organizers 5th International Workshop on Multi-Level Modelling (MULTI) 3rd International Workshop on Collaborative Modelling in MDE (COMMitMDE) 12th Workshop on Models and Evolution (ME) 4th International Workshop on Executable Modeling (EXE) { Bernd Neumayr { Adrian Rutle { Tony Clark { Sebastian Gotz { Nelly Bencomo { Kirstie Bellman { Gordon Blair { Jan Bosch { Ivano Malavolta { Sebastien Gerard { Henry Muccini { Dimitris Kolovos { Ludovico Iovino { Alfonso Pierantonio { Dalila Tanzalit { Tanja Mayerhofer { Philip Langer { Ed Seidewitz { Je Gray { Erwan Bousse 3rd International Workshop on Human Factors in Modeling (HuFaMo) { Miguel Goul~ao { Patrick Heymans { Xavier Le Pallec { Emmanuel Renaux { Silvia Abrah~ao { Simon Van Mierlo { Hans Vangheluwe { Manuel Wimmer { Erwan Bousse { Clark Verbrugge 2nd International Workshop on Debugging in Model-Driven Engineering (MDEbug) 2nd Workshop on Model-Driven Engineering Tools (MDETools) { Mojtaba Bagherzadeh { Francis Bordeleau { Juergen Dingel { Michalis Famelis { Antonio Garcia-Dominguez { Raquel Araujo Oliveira { Ernesto Posse { Ed Seidewitz { Bran Selic { Ernesto Posse { Raquel Araujo de Oliveira { Levi Lucio { Faiez Zalila. { Erwan Bousse { Benoit Combemale { Je Gray { Achim D. Brucker { Robert Clariso { Hao Wu 15th Workshop on Model Driven Engineering, Veri cation and Validation (MoDeVVa) { Francis Bordeleau { Michalis Famelis { Jennifer Horko { Andreas Wortmann { Sebastian Gotz { Nico Hochgeschwender { Andreas Wortmann { Sebastian Wrede 5th International Workshop on Model-Driven Robot Software Engineering (MORSE) 4th Flexible MDE Workshop (FlexMDE) { Alfonso Pierantonio { Juan De Lara { Davide Di Ruscio 5th International Workshop on Interplay of Model-Driven and Component-Based Software Engineering (ModComp) 1st Workshop on Analytics and Mining of Model Repositories (AMMoRe) { Federico Ciccozzi { Antonio Cicchetti { Andreas Wortmann { O nder Babur { Michel Chaudron { Loek Cleophas { Davide Di Ruscio { Dimitris Kolovos { Nicolas Ferry { Arnor Solberg { Manuel Wimmer { Federico Ciccozzi 2nd International Workshop on Model-Driven Engineering for IoT (MDE4IoT)