1. A system to coordinate at least one of communications, collaboration, and coordination between parties, comprising: a user state identifier that determines a user's state from at least one context information source, wherein the user state identifier generates an indication of whether a user state change has occurred from the at least one context information source; and a data log that stores information associated with the at least one context information source at about the time of the user state change to accumulate statistics relating to at least one of an availability and an unavailability of the user.