The University of Southampton
University of Southampton Institutional Repository

A Multi-Dimensional Trust Model for Heterogeneous Contract Observations

Reece, Steven, Rogers, Alex, Roberts, Stephen and Jennings, N. R. (2007) A Multi-Dimensional Trust Model for Heterogeneous Contract Observations At Twenty-Second AAAI Conference on Artificial Intelligence, Canada. , pp. 128-135.

Record type: Conference or Workshop Item (Paper)


In this paper we develop a novel probabilistic model of computational trust that allows agents to exchange and combine reputation reports over heterogeneous, correlated multi-dimensional contracts. We consider the specific case of an agent attempting to procure a bundle of services that are subject to correlated quality of service failures (e.g. due to use of shared resources or infrastructure), and where the direct experience of other agents within the system consists of contracts over different combinations of these services. To this end, we present a formalism based on the Kalman filter that represents trust as a vector estimate of the probability that each service will be successfully delivered, and a covariance matrix that describes the uncertainty and correlations between these probabilities. We describe how the agents’ direct experiences of contract outcomes can be represented and combined within this formalism, and we empirically demonstrate that our formalism provides significantly better trustworthiness estimates than the alternative of using separate single-dimensional trust models for each separate service (where information regarding the correlations between each estimate is lost).

PDF aaai_248_reece_s.pdf - Other
Download (656kB)

More information

Published date: 2007
Additional Information: Event Dates: July 2007
Venue - Dates: Twenty-Second AAAI Conference on Artificial Intelligence, Canada, 2007-07-01
Organisations: Agents, Interactions & Complexity


Local EPrints ID: 263867
PURE UUID: 99679248-cc75-4039-afdc-554ae3a75060

Catalogue record

Date deposited: 11 Apr 2007
Last modified: 18 Jul 2017 07:41

Export record


Author: Steven Reece
Author: Alex Rogers
Author: Stephen Roberts
Author: N. R. Jennings

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.