ABSTRACT
In the recent past, considerable research has been devoted to trust mechanisms to simplify complex transactions for open environments in social networking, e-commerce, and recommender systems (RSs) [1,2]. Such open environments are largely developed using multiagent systems, which are vulnerable to malicious agents and hence pose a big challenge: the detection and prevention of undesirable behaviors. Trust in multiagent systems is used for minimizing the uncertainty in the interactions among the autonomous entities such as agents. Nevertheless, in spite of this challenge, various user support systems have been created in the last few years using multiagent systems because of the many benets they offer. User support systems are specialized tools to assist users in a variety of computer-mediated tasks by providing guidelines or hints. RSs are a special class of user support tools that act in cooperation with users, complementing their abilities and augmenting their performance by offering proactive or on-demand, context-sensitive support. Agent-based RSs incorporate techniques such as inferring user preferences and smart reasoning based on the available data, which are key requirements in proactive, autonomous operation for achieving intelligent assistance for the
CONTENTS
Introduction ......................................................................................................... 315 Traditional Recommender System Technologies and the Challenges ......... 317 Basic Concepts: Trust and Argumentation ...................................................... 319 Modeling Trust for an Argumentation-Based Recommender System ........ 320 Unifying Trust and Argumentation with Agent Reasoning ......................... 325 An Illustration from a Book Recommendation Scenario............................... 328 State-of-the-Art Recommender Systems and Possible Extensions .............. 331
Some Recent Developments and Open Challenges ..................................333 Conclusion ...........................................................................................................335 References .............................................................................................................335
