Knowledge Representation and Reasoning

Welcome to the group headed by Johannes (P.) Wallner, specializing on Knowledge Representation & Reasoning (KRR).

If you are interested in student topics (e.g., for a Bachelor's or Master's thesis) you can have look at the topics page. A Bachelor's or Master's thesis can be started anytime (contact).

Broadly construed, knowledge representation & reasoning in Artificial Intelligence is concerned with foundational research questions such as how to represent knowledge and how to reason based on knowledge. Our research and teaching focuses on

  • formal studies of prominent logic-based representations of knowledge, and
  • addressing challenging computational reasoning tasks arising in KRR.

Our research agenda is to further understanding of complex forms of reasoning in knowledge representation, and to bring promising approaches closer to application, by going from theory to practice.

One of our main current areas is computational argumentation. For a general introduction to the topic, you can have a look, e.g., at the Handbook of Formal Argumentation or this article

Below you find recent news (news archive).

Recent News


Summer School Course

1.6.2026

Wallner was invited to give a summer school course on topics in computational argumentation at the summer school at the 11th International Conference on Computational Models of Argument (COMMA 2026). 


Organization of ICCMA 2027

1.6.2026

We will participate in the organization of the seventh International Competition on Computational Models of Argumentation (ICCMA'27). We are looking forward to submissions with novel algorithmic approaches for computational hard reasoning tasks in argumentation!


Talk at THEMA

1.6.2026

We will present ongoing work on utilizing forms of abstraction for computational argumentation at the THEMA workshop, part of this year's FLoC in Lisbon. 


Paper Accepted to KR

17.04.2026

Our work on "Computational Complexity in Timed Argumentation Frameworks" was accepted to KR 2026. In this work, we consider an extension of a time component to arguments, and attacks between arguments. We investigate the resulting computational complexity of reasoning. This work will also be presented (without formal proceedings) at a national French conference RDPIA under "Complexité des Systèmes d'Argumentation Temporels". 


Best Student Paper Award af FoIKS 2026

30.3.2026

Our work on "Utilizing Binary Decision Diagrams for Compiling Argumentation Frameworks" received the Best Student Paper award at FoIKS 2026! We congratulate Michael Baier for his contributions to this work!


Marietta Blau Stipend awarded to Iosif Apostolakis

25.1.2026

Our team member Iosif Apostolakis was awarded a Marietta Blau stipend for expanding on his PhD thesis work. Marietta Blau stipends are granted for PhD students to extend their horizon and PhD work abroad of Austria. Apostolakis will work together with the Symbolic AI Group, coordinated by Giorgos Flouris, in Crete.