17. A method comprising: identifying causal relationships between a plurality of documents; identifying a plurality of characteristics of a communication, including a modality used, actors involved, and proximate events of relevance; enabling a user to query based on all of the characteristics available; evaluating actor behavior over time, to create a threshold behavior for the actor; and identifying deviations from the threshold behavior.
17. A method comprising: identifying causal relationships between a plurality of documents; identifying a plurality of characteristics of a communication, including a modality used, actors involved, and proximate events of relevance; enabling a user to query based on all of the characteristics available; evaluating actor behavior over time, to create a threshold behavior for the actor; and identifying deviations from the threshold behavior. 19. The method of claim 17 , wherein the behavior includes one or more of the following: a reply cycle to communications, tone used, communications modality used.