1. In a communications system, the analysis of traffic rates, volumes, densities, capacities, and patterns specifically for system performance improvement. 2. The study of communications characteristics external to the text. 3. The analysis of the communications-electronic environment for use in the design, development, and operation of new communications systems. 4. In cryptology, the inference of information from observation and analysis of the presence, absence, amount, direction, and frequency of the traffic flow. 5. The Study of communications patterns. 6. The inference of information from observation of traffic flows (presence, absence, amount, direction and frequency. )