1. A method of assembling a first object to a second object comprising the steps of: providing a robot arm with a plurality of sensors mounted thereon; associating the first object with the robot arm for manipulation thereby; electro-optically sensing the location of a plurality of known references points on one of the first and second objects using a respective one of the plurality of sensors for each reference point; determining the location of the robot arm relative to the one of the objects using the sensed locations of the reference points; moving the robot arm to precisely position the first object relative to the second object; and assembling the first object to the second object while the first object is precisely positioned relative to the second object by the robot arm.