Abstract: A software and/or hardware facility for scoring the quality of traffic to a site accessible via the Internet or other network. The facility may evaluate traffic based on multiple agent actions in order to detect bogus agent actions. The agent actions may be generic agent actions that are applicable to substantially all network sites. The facility may characterize the quality of an agent's interaction with the network site based on whether one or more of the multiple agent actions occurred during the agent's interaction. The facility may generate non-binary generic and custom scores, classifying traffic as fraudulent if its custom score is substantially higher than its generic score. The facility may characterize the quality of traffic to a network site based on dual algorithms. A first algorithm may be applied to traffic that is statistically significant, while a second algorithm may be applied to traffic that is not statistically significant.