1. In a system including a computing environment coupled to a capture device for capturing state information from a field of view of the capture device, the state information representing a position of a user, a method of estimating state information comprising: (a) receiving image data from the field of view; (b) producing one or more computer models estimating state information by one or more experts; and (c) analyzing the one or more computer models produced in said step (b) by one or more methodologies of an arbiter to choose one or more computer models estimated to be the best representation of the state information.