The everyday contad toith customers of the Bell System is carried out in approximately 21(X) business offices. The assessment of such a large number of offiees makes the continued improvement of formal offiee measurement schemes altrcutive. This paper describes an analysis of modele for time •usage in Bell System business offices. In addition, it was hoped that these models would be potentially useful for interoffiee comparisons. A model for single offices is described first. This is follovKd by the development of a multioffice model which is constructed in su4:h a way that it has good statistical characteristics and attempts to make the office comparisons as fair as poss^le.