  The aim of the Transformation Tool Contest (TTC) series is to compare the
expressiveness, the usability and the performance of graph and model
transformation tools along a number of selected case studies. Participants want
to learn about the pros and cons of each tool considering different
applications. A deeper understanding of the relative merits of different tool
features will help to further improve graph and model transformation tools and
to indicate open problems.
  TTC 2013 involved 18 offline case study solutions: 6 solutions to the
FlowGraphs case, 9 solutions to the Petri Nets to Statecharts case and 3
solutions to the Restructuring case. 13 of the 18 solutions have undergone a
non-blind peer review before the workshop and were presented and evaluated
during the workshop in Budapest. This volume contains the submissions that have
passed an additional (post-workshop, blind) reviewing round.
