For the past twenty years, the ACM Symposium on Applied Computing has been a primary gathering forum for applied computer scientists, computer engineers, software engineers, and application developers from around the world.

SAC 2009 is sponsored by the ACM Special Interest Group on Applied Computing. Its proceedings are published by ACM in both printed form and CD-ROM; they are also available on the Web through the ACM Digital Library. More information about SIGAPP and past editions of SAC can be found at http://www.acm.org/sigapp. The best papers may also be published in a Journal Special Issue.

Aims and scope of the TRECK track:

Computational models of trust and online reputation mechanisms have been gaining momentum. The ACM SAC 2005, 2006, 2007 and 2008 TRECK tracks attracted researchers from both academia and industry who have joined an online group at http://tech.groups.yahoo.com/group/trustcomp/

The goal of the ACM SAC 2009 TRECK track remains to review the set of applications that benefit from the use of computational trust and online reputation. Computational trust has been used in reputation systems, risk management, collaborative filtering, social/business networking services, dynamic coalitions, virtual organisations and even combined with trusted computing hardware modules. The TRECK track covers all computational trust/reputation applications, especially those used in real-world applications.

The topics of interest include, but are not limited to:

• Recommender and reputation systems
• Trust management, reputation management and identity management
• Pervasive computational trust and use of context-awareness
• Mobile trust, context-aware trust
• Web 2.0 reputation and trust
• Trust-based collaborative applications
• Automated collaboration and trust negotiation
• Trade-off between privacy and trust
• Trust/risk-based security frameworks
• Combined computational trust and trusted computing
• Tangible guarantees given by formal models of trust and risk
• Trust metrics assessment and threat analysis
• Trust in peer-to-peer and open source systems
• Technical trust evaluation and certification
• Impacts of social networks on computational trust
• Evidence gathering and management
• Real-world applications, running prototypes and advanced simulations
• Applicability in large-scale, open and decentralised environments
• Legal and economic aspects related to the use of trust and reputation engines
• User-studies and user interfaces of computational trust and online reputation applications