We propose an agent based language, aimed at representing the epistemic states of users of interactive systems, with the goal to devise domain independent tools for building, updating and maintaining user models. The need of coping with change and update motivates the choice to deene our language within the Situation Calculus. We refer to a multi agent Situation Calculus with clusters of altern...

We investigate agent supervision, a form of customization, which constrains the actions of an agent so as to enforce certain desired behavioral specifications. This is done in a setting based on the Situation Calculus and a variant of the ConGolog programming language which allows for nondeterminism, but requires the remainder of a program after the execution of an action to be determined by th...

Accounts of belief and knowledge in the Situation Calculus have been developed and discussed for some time yet there is no extant implementation. We develop a practical implementation of belief and belief change in the Situation Calculus based on default logic for which we have an implemented solver. After establishing the mapping with default logic we demonstrate how belief change in the Situa...

A dynamical systems approach for modeling changing spatial environments is formalised. The formalisation adheres to the representational and computational semantics of situation calculus and includes a systematic account of all aspects necessary to implement a domain-independent qualitative spatial theory that is applicable across diverse application areas. Foundational to the formalisation is ...

The robot, on the other hand, is eager to learn both the best sequence of actions, their timing and how they interlace. The cross relation among actions is specified both in terms of time intervals for their execution, and in terms of location in space to cope with the instruction interaction with people and objects in the scene. We outline this process: how to transform the rich information de...

Most solutions to the technical frame problem in theories of actions depend on special axioms like the frame axioms, the law of inertia, or the successor state axioms. In these solutions facts about a situation are regarded and represented as properties which hold in the situation. In this article it is argued that it is often more adequate to view facts about a situation as resources which are...

We model belief change due to noisy sensing, and belief introspection in the framework of the situation calculus. We give some properties of our axiomatization and show that it does not suffer from the problems with combining sensing, introspection, and plausibility update described in Shapiro et al. [2000].

A method to recognize agent’s intentions is presented in a framework that combines the logic of Situation Calculus and Probability Theory. The method is restricted to contexts where the agent only performs procedures in a given library of procedures, and where the system that intends to recognize the agent’s intentions has a complete knowledge of the actions performed by the agent. An original ...

Initially, situation semantics was conceived as essentially synthetic, with a mathematical ontology built up on set theory. Soon after the appearance of [4], however, the authors changed their approach and decided to handle the topic in an analytic fashion, abstracting a mathematical ontology from analyses of natural language use. Situation theory is the name they gave to the underlying mathema...

The 2008 economic crisis has resulted in a dramatic increase of youth unemployment in most developed countries. A 26.5 per cent increase in their number and a rate remaining close to the crisis peak is still recorded in 2012. These striking levels are not yet a new feature for some labour market like in France and recent studies reveal major disparities according to the residential location, ev...