TTC 2026

Transformations of structured data, such as relational data, abstract syntax trees and high-level graph-basedmodels are cross-disciplinary at the heart of a wide range of applications. The success of transformation methods heavily depends on the availability of expressive and efficient tools. A large variety of tools exist for different transformation methods. Yet, for potential users, working in application domains where transformation techniques may be useful, it is difficult to select the right tool for their purpose. The aim of this event is to evaluate and compare the expressiveness, the usability and the performance of transformation tools for structured data along a number of selected challenging case studies.

Accepted Papers

Call for Papers

The 2026 Transformation Tool Contest (TTC) seeks your own spins of four interesting model transformation problems. The deadline for solution descriptions is April 14 May 3, immediately followed by a round of open peer reviewing. As in previous editions, solution descriptions will be published in a post-proceedings volume, and lead to continued collaboration for producing a per-case journal article.

About TTC

The aim of this event is to compare the expressiveness, the usability and the performance of graph, model and program transformation tools along a number of selected case studies. A deeper understanding of the relative merits of different tool features will help to further improve transformation tools and to indicate open problems.

This contest is the seventeenth of its kind (after an AGTiVE 2007 session, as GraBaTs 2008 and 2009 contests, and the TTC 2010, 2011, 2013--2025 contests). For the eighth time, the contest is co-located with several leading software engineering conferences as part of the Software Technologies: Applications and Foundations (STAF) federation. Teams from the major international research groups in the development and use of transformation tools are expected to participate in the TTC again.

Participating in the Contest

The following case studies have been selected:

• Program abstraction by transformation: Abstraction of Visual Basic to UML (Resources).
• The Families to Persons Case — Revisited (Resources)
• Any of the older cases (see below)

The case description, supporting resources, and discussion between solution developers are hosted at the source code repositories linked to above.

If you would like to participate in the contest, you are now asked to take your favourite transformation tool and submit your solutions. A submission should consist of a paper and the actual solution (i.e., programs, models, etc.). The paper should include a description of the chosen case study variant (if any) and a presentation of the chosen solution, including a discussion of design decisions. Examples can be explored at the TTC 2021 website.

Solutions should be submitted via Easychair by April 14 May 3. Before the same deadline, each case study solution (tool, project files, documentation) should be made available for review and demonstration via a public version control repository (e.g. on Github or Bitbucket). Docker Hub images would be highly appreciated as well.

Immediately after the submission deadline, please note solution developers will be asked to participate in a round of open review of other solutions. Therefore, we ask that all solution developers are available in the period immediately following the submission deadline to participate in these discussions.

Solutions to older cases

Transformation tools have evolved and continue to evolve, but use cases of the past are still relevant. To foster a culture of community-accepted benchmarks, the TTC now also accepts submissions that solve older cases. References to prior cases can be found here. Please note that for solutions to these prior cases, we expect solution authors to compare their solutions with other existing solutions.

Submissions of solutions to past cases will undergo the same peer-review process as solutions to the selected case from this year, but there will not be an open peer review. We will try to have the solution submission reviewed by of the original case authors or original solution authors.

Publication Procedure

For TTC 2026 there will be several publication opportunities:

• There will be formal contest proceedings. Solution submitters have to consider and address the opponents' statements. The resulting solution papers will be reviewed by the TTC program committee. A selection of revised solution papers together with the case descriptions will be published in the contest proceedings.
• Most cases were reviewed by a steering committee, judging the suitable publication venues, significance of the problem statement, and appropriateness of the evaluation methodology. This feedback was passed on to case authors to allow the case to be improved, with the aim to facilitate a thorough comparison of the state-of-the-art in model transformation, which may be submitted to one of the following journals after the workshop:
• The International Journal on Software and Systems Modeling (SoSyM)
• The Journal of Object Technology (JOT)
• The International Journal on Software Tools for Technology Transfer (STTT)

For solutions to past cases, the journal publishing option is usually only available if there was no previous journal article about this case.