1. Faculty of Informatics, Technical University of Vienna, Vienna, Austria. E-mail: marta.sabou@ifs.tuwien.ac.at
2. Computer Science Department, Vrije Universiteit Amsterdam, The Netherlands. E-mail: lmaroyo@gmail.com
3. Department of Computer Science, University of Sheffield, Sheffield, United Kingdom. E-mails: k.bontcheva@sheffield.ac.uk, rkqarout1@sheffield.ac.uk
4. Software Technology Department, Delft University of Technology, Delft, The Netherlands. E-mail: a.bozzon@tudelft.nl