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Deception has been an important problem in interactive groups, impeding effective group communication and group work, yet deception detection in such a context remains understudied. Extrapolated from the interpersonal deception theory (IDT) and group composition research in cooperative contexts, this research proposes that group factors, including diversity and familiarity, have influence on the performance of deception detection. The measurement of group performance was not limited to success, as previous deception studies did, but included efficiency as well because it is fundamental to the effectiveness of deception detection. An analysis of data collected from a real-world online community found that behavioral familiarity had a positive effect, and gender diversity had a negative effect, on group success in deception detection. In addition, behavioral familiarity had a negative effect and functional diversity had a positive effect on the group efficiency of deception detection. The findings not only extend IDT in several important ways but also suggest the need to distinguish between noncooperative and cooperative groups, an important theoretical implication for group composition research.

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Web service composition (WSC) has emerged as a promising approach to integrating business applications within and across organizational boundaries. One of the major objectives of WSC research is to improve the performance of composite Web services. To this end, alliance information between different services partners has great potential, but has been overlooked by extant approaches to composing Web services. To address the above limitation, we propose an allianceaware method for WSC in this paper, which incorporates the alliance information in constructing Web services. In addition, we adopt a multi-agent architecture to model and evaluate methods for WSC. Our experiment results reveal a significant impact of alliance information on the performance of WSC. We believe our findings on WSC are important to both WSC researchers and practitioners.