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Television allocation is technically dependent upon the properties of the television system comprising, in sequence, the transmitter plant, the propagation path, the receiver plant and the observer. Performance is limited either by receiver noise or by noise and undesired signals entering by way of the receiver antenna. Analysis of this system and its components has led to criteria by means of which service may be defined. These criteria have been incorporated in a procedure for producing maps portraying selected isoservice contours applicable as defining boundaries of the several grades of service. Precision of portrayal is limited essentially by the uncertainty of measurement or prediction of propagation which has led to the use of quasistatistical methods of treatment. Some resulting limitations are pointed out.