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Journal of Logic and Computation Advance Access originally published online on August 2, 2007
Journal of Logic and Computation 2007 17(5):983-1018; doi:10.1093/logcom/exm050
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© The Author, 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Original Articles

Goal Change in the Situation Calculus*

Steven Shapiro

Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S 3G8, Canada. E-mail: shapiro{at}mie-toronto.edu

Yves Lespérance

Department of Computer Science and Engineering, York University, Toronto, ON, M3J 1P3 Canada. E-mail: lesperan{at}cse.yorku.ca

Hector J. Levesque

Department of Computer Science, University of Toronto, Toronto, ON, M5S 3G4, Canada. E-mail: hector{at}cs.toronto.edu

Received 9 July 2007.


  Abstract

Although there has been much discussion of belief change (e.g. [4, 21]), goal change has not received much attention. In this paper, we propose a method for goal change in the framework of Reiter's; [12] theory of action in the situation calculus [8, 10], and investigate its properties. We extend the framework developed by Shapiro et al. [17] and Shapiro and Lespérance [16], where goals and goal expansion were modelled, but goal contraction was not.

Keywords: Belief change; goal change; theories of action; situation calculus

*An earlier version of this paper appeared in Proc. IJCAI-05 [18].


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