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In psychology and sociology, a trust metric is a measure of how a member of a group is trusted by the other members. Trust metrics may be abstracted in a manner that can be implemented on computers, making them of interest for the study and engineering of virtual communities, such as Friendster and LiveJournal. Attack resistance is an important property of trust metrics which reflects their ability to handle agents who participate in bad faith (i.e. who aim to abuse the presumption of trust).

The first forms of trust metrics in computer software were in applications like eBay's Feedback Rating. Slashdot introduced its notion of karma, earned for activities perceived to promote group effectiveness, an approach that has been very influential in later virtual communities.

The free software developer resource Advogato is based on a novel approach to attack resistant trust metrics of Raph Levien. Levien observed that Google's PageRank algorithm can be understood to be an attack resistant trust metric rather similar to that behind Advogato. Despite the trust metric a widely-known internet kook has gained posting privileges to the front page^[1] of Advogato, illustrating just how complex the problem of trust is.

Trust Metrics Wiki is a Wiki whose goal is to review, understand, code and compare on same data all the trust metrics proposed so far.

• See subjective logic for a mathematical (algebraic) treatment of trust measurement and calculation.
• Trust (sociology)
• Trustworthiness
• Subjective logic

• Trust Metrics Evaluation Project of Paolo Massa. The Analyzed Trust Metrics page provides an extensive bibliography of work on the theory and implementation of trust metrics.
• Trustcomp.org is an online community of more than 150 academic and industrial members who research computational trust management and online reputation. There is also a mailing list.
• Raph Levien, 2000. Advogato's trust metric. Electronic manuscript.
• Raph Levien, 2002. Attack Resistant Trust Metric Metadata HOWTO. Electronic manuscript.

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