1. A system for use in managing activity of interest within an enterprise, comprising a computer having a model for tracking one or more human objects in a scene related to the enterprise and configured to (i) access key activity data comprising object data related at least to the human features, locations, movement patterns, and predetermined other human activity of a human object relative to other physically and visually distinct objects in a scene related to the enterprise, (ii) receive sensor data that is taken in by a sensor of a predetermined scene related to the enterprise, (iii) extract solely from the sensor data changes that enables separation of foreground and background objects, including human objects, localization of human object features, and connection of object features that should be connected, (iv) classify the extracted objects, including extracted human objects, in plurality of classes of objects of different features, shapes, movement and behavioral patterns, (v) determine whether a human object is new to the human object data in the computer and initiating tracking of the new human object and if the human object exists as object data in the computer updating a track of the existing human object, and update the computer model in accordance with the foregoing, and (vi) compare human object data to key activity data and produce a key activity message, wherein the key activity message contains any or all of the following elements: what is moving or changing, a person, animal, machine, or other inanimate object; what behavior the moving or changing object is engaged in; where the object is located; when the motion or change is occurring and measurable interpretation of the change in phenomena or activity in order to make a decision by a machine or a human for a purpose.