International Workshop on Preferences in Logic Programming Systems

For up-to-date information about this workshop, please visit also the Workshop Page in the FLOC site.


The concept of preference has played an important role in various aspects of computer science. For example, preferences play a key role in the design of practical and efficient reasoning systems dealing with real-world knowledge. The concept of preference has been investigated by many researchers in different fields, both within Computer Science (e.g., Artificial Intelligence, Optimizations, Scheduling) and outside of Computer Science (e.g., Economics, Decision Theory).

In recent years we have witnessed a growing interest in studying the integration of preferences in the context of logic-based and logic programming systems. These directions of research are of great importance, considering that preferences are considered a vital component of reasoning with real-world knowledge, and logic programming is one of the most widely used programming paradigms employed in knowledge representation and reasoning.

This workshop attempts to address all aspects of describing, modelling, computationally handling, and application of preferences, within the context of logic programming. In particular, we seek contributions that create cross-fertilization between different approaches to preferences and different flavors of logic programming (e.g., constraint logic programming, answer set programming), hopefully leading to new, more general, approaches for handling preferences in logic programming.

The workshop topics include, but are not limited to:
  • preferences in logic programming
  • preferences in answer set programming
  • preferences in logic-based planning
  • soft constraints
  • knowledge representation and reasoning with preferences
  • languages for preferences description
  • systems and experiences
  • applications of preferences

The purpose of this workshop is to bring together researchers interested in modeling and implementing preferences in logic programming. The objective is to promote exchange of ideas and possible integration between the different approaches proposed so far.

The workshop is co-located with the 22nd International Conference on Logic Programming.

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  • Mauricio Osorio, Claudia Zepeda
    Preferences for General Theories in Answer Sets
  • James Delgrande, Torsten Schaub, and Hans Tompits
    A Preference-Based Framework for Updating Logic Programs: Preliminary Report
  • Alessandra Mileo, Torsten Schaub
    Extending Ordered Disjunctions for Policy Enforcement: Preliminary report
  • Toshiko Wakaki, Kazuo Tomita
    Compiling Prioritized Circumscription into General Disjunctive Programs
  • Tu Phan, Tran Son, and Enrico Pontelli
    Planning with Preferences Using Constraint Logic Programming
  • Pallavi Tambay, Bharat Jayaraman
    Relaxation in Preference Logic Programs
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Participants  should  submit a paper  (maximum 15 pages,  PDF format),  describing  their work  in topics  relevant  to the  workshop.
Accepted papers  will be presented  during the workshop.   At least one author  of an accepted contribution  is expected to register for the workshop, and present the paper. All  submissions  should  include   the  author's  name(s), affiliation, complete mailing address, and email address.
Authors are requested to prepare their submissions, following the LNCS/LNAI Springer format. Please see:
for further details.

The submission  should be sent    in PDF format, using the submission web site:
Prefs 2006 Submission Site
The deadline for receipt of submissions is June 1, 2006. Papers received after this date may not be reviewed. Eligible  papers  will  be  peer-reviewed  by  members of the Program Committee.
Authors will be notified via email of the results by June 20, 2006. Authors of accepted papers are expected  to improve their paper based on reviewers' comments and to send a camera ready version of their manuscripts by June 30, 2006.
Accepted papers will be included in the workshop proceedings, which will be distributed to the participants.
Questions about submissions may be directed to the workshop organizers.

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Important DatesIMPORTANT DATES  

The proposed schedule of important dates for the workshop is as follows:

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Workshop Organizers WORKSHOP ORGANIZERS  

Enrico Pontelli and Tran Cao Son
Department of Computer Science
New Mexico State University
Email: epontell @   tson @

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Program CommitteePROGRAM COMMITTEE  

Marcello Balduccini, Department of Computer Science, Texas Tech University, USA

Gerhard Brewka, Intelligent Systems Department, University of Leipzig, Germany

Ulrich Junker, ILOG, France 

Enrico Pontelli, Department of Computer Science, New Mexico State University, USA

Torsten Schaub, Institute of Informatics, University of Potsdam, Germany

Tran Cao Son, Department of Computer Science, New Mexico State University, USA

Mirek Truszczynski, Department of Computer Science, University of Kentucky, USA

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