[TYPES/announce] 2nd CFP - Express/SOS 2026 (@CONFEST)

[Giorgio Bacci]

*** CALL FOR PAPERS EXPRESS/SOS at CONFEST2026

[Apologies for multiple postings]

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2nd Call for Papers Express/SOS 2026

 * Venue: Liverpool, UK, September 5, 2026
 * Submission deadline: June 22, 2026 (full and short papers)
 * Website: https://urldefense.com/v3/__https://expresssos.github.io/conf/2026__;!!IBzWLUs!QjsTlTRJiXZmR6vOKbDQNhwkIjGxWcYhAPCKS7DlwD7YQ6VAyMLVdK56a52gGd9i5JyhKX6y_xSWpbiZEz3HRRCMmliJbcPM$ 
 * Invited Speakers: Nobuko Yoshida (Oxford University) & Fabio Zanasi (UCL)

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Combined 33rd International Workshop on Expressiveness in Concurrency 
and 23rd Workshop on Structural Operational Semantics (Express/SOS 2026)

Liverpool, UK, September 5, 2026, affiliated with CONCUR 2026
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== IMPORTANT DATES
- Paper Submission: June 22, 2026 
- Notification to authors: July 25, 2026
- Workshop: September 5, 2026
- Final version (post-proceedings): October 25, 2026

== SCOPE AND TOPICS
The EXPRESS/SOS workshop series aims to bring together researchers interested in the formal semantics of systems and programming concepts, and in the expressiveness of computational models.

Topics of interest for EXPRESS/SOS 2026 include, but are not limited to:
- expressiveness and rigorous comparisons between models of computation (process algebras, event structures, Petri nets, rewrite systems)
- expressiveness and rigorous comparisons between programming languages and models (distributed, component-based, object-oriented, service-oriented);
- logics for concurrency (modal logics, probabilistic and stochastic logics, temporal logics and resource logics);
- analysis techniques for concurrent systems;
- theory of structural operational semantics (meta-theory, category-theoretic approaches, congruence results);
- comparisons between structural operational semantics and other formal semantic approaches;
- applications and case studies of structural operational semantics;
- software tools that automate, or are based on, structural operational semantics.

We especially welcome contributions bridging the gap between the above topics and neighbouring areas, such as, for instance:
- computer security
- multi-agent systems
- programming languages
- formal verification
- reversible computation
- knowledge representation

== SUBMISSION GUIDELINES:

We invite two types of submissions:
* Full papers (up to 15 pages, excluding references).
* Short papers (up to 5 pages, excluding references, not included in the workshop post-proceedings)

All submissions have to adhere to the EPTCS format (https://urldefense.com/v3/__https://info.eptcs.org/__;!!IBzWLUs!QjsTlTRJiXZmR6vOKbDQNhwkIjGxWcYhAPCKS7DlwD7YQ6VAyMLVdK56a52gGd9i5JyhKX6y_xSWpbiZEz3HRRCMmrOCkYbR$ ).
Simultaneous submission to journals, conferences or other workshops is only allowed for short papers; full papers must be unpublished.

Submission is performed through EasyChair:
https://urldefense.com/v3/__https://easychair.org/conferences/?conf=expresssos2026__;!!IBzWLUs!QjsTlTRJiXZmR6vOKbDQNhwkIjGxWcYhAPCKS7DlwD7YQ6VAyMLVdK56a52gGd9i5JyhKX6y_xSWpbiZEz3HRRCMmqoAfOdg$ 

The final versions of accepted full papers will be published in EPTCS.
It is understood that for each accepted submission, one of the co-authors will register for the workshop and present the paper.

* We are pleased to announce the possibility of a Joint Special Issue with EXPRESS/SOS 2025 (due in December 2026).

== INVITED SPEAKERS:

Nobuko Yoshida (Oxford University)
Fabio Zanasi (University College London)

== WORKSHOP CO-CHAIRS:

Giorgio Bacci (University of Aalborg, Denmark)
Anna Philippou (University of Cyprus, Cyprus)

== PROGRAM COMMITTEE:

Henning Basold (LIACS, Leiden University, The Netherlands)
Giovanni Bernardi (Université Paris Diderot - IRIF, France)
Marco Bernardo (University of Urbino, Italy)
Chiara Bodei (University of Pisa, Italy)
Johannes Borgström (Uppsala University, Sweden)
Georgiana Caltais (University of Twente, The Netherlands)
Pedro R. D’Argenio (Universidad Nacional de Córdoba - CONICET, Argentina)
Emanuele D’Osualdo (University of Konstanz, Germany)
Fatemeh Ghassemi (University of Tehran, Iran)
David N. Jansen (Institute of Software, Chinese Academy of Sciences, China)
Vasileios Koutavas (Trinity College Dublin, Ireland)
Dimitrios Kouzapas (University of Glasgow, Scotland)
Doriana Medić (University of Turin, Italy)
Luca Padovani (University of Bologna, Italy)
Jovanka Pantovic (University of Novi Sad, Serbia)
Marco Peressotti (University of Southern Denmark, Denmark)
Tatjana Petrov (University of Trieste, Italy)
Jorge A. Pérez (University of Groningen, The Netherlands)
Emilio Tuosto (Gran Sasso Science Institute, Italy)


== CONTACT
In case of questions, prospective authors are encouraged to contact the co-chairs at
grbacci at cs.aau.dk or annap at ucy.ac.cy