Preface
The aim of the Transformation Tool Contest (TTC) series is to compare the expres-
siveness, the usability, and the performance of graph and model transformation tools
along a number of selected case studies. A deeper understanding of the relative merits
of di↵erent tool features will help to further improve graph and model transformation
tools and to indicate open problems.
   This contest was the seventh of its kind. For the second time, the contest was part
of the Software Technologies: Applications and Foundations federation of conferences.
Teams from the major international players in transformation tool development have
participated in an online setting as well as in a face-to-face workshop.
   In order to facilitate the comparison of transformation tools, our programme com-
mittee selected the following two challenging cases via single blind reviews: the FIXML
case (for which eventually ten solutions were accepted) and the Movie Database case
(for which eventually nine solutions were accepted).
   These proceedings comprise descriptions of the two cases, descriptions of all of the
solutions to these cases, and a summary of the results of the contest. In addition to the
solution descriptions contained in these proceedings, the implementation of each solution
(tool, project files, documentation) is made available for review and demonstration via
the SHARE platform (http://share20.eu).
   TTC 2014 involved open (i.e., non anonymous) peer reviews in a first round. The
purpose of this round of reviewing was that the participants gained as much insight
into the competitors solutions as possible and also to raise potential problems. At the
workshop, the solutions were presented. The expert audience judged the solutions along
a number of case-specific categories, and prizes were awarded to the highest scoring
solutions in each category. A summary of these results for each case are included in
these proceedings. Finally, the solutions appearing in these proceedings were selected
by our programme committee via single blind reviews.
   Besides the presentations of the submitted solutions, the workshop also comprised a
live contest. That contest involved a set of tasks for playing a turn-based soccer game
(inspired by the recent FIFA 2014 soccer world cup in Brazil). The challenge required
participants to write a transformation that analysed a soccer pitch model containing
positions of the ball and players on both teams, and responded with a model that
specified updates to the positions and actions of the players on the participant’s team.
A server component was used to play several games of soccer between each participant
in a round-robin style, and consequently a winner was determined.
   The contest organisers thank all authors for submitting cases and solutions, the contest
participants, the STAF local organisation team, the STAF general chair Richard Paige,
and the program committee for their support.


25th July, 2014
                                                                           Louis M. Rose
York, United Kingdom
                                                                         Christian Krause
                                                                             Tassilo Horn


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