The existing problems in the optimal construction of measuring systems are considered. The solution is shown
due to the use of exchange curves by Gutkin L.S. The exchange curves can explain which meters are most optimal, how to agree on metrics quality, how to overcome the need for large a priori uncertainty, without reducing the accuracy, how to explain the contradictions of some theories, how to reconcile the a priori range with the physical range, how to use a priori data, how it affects accuracy measurement of the variable signal level, how the accuracy of the setting affects the accuracy of measurements, how can the signal search time be reduced, how it affects the system of automatic control, the nature of the monitoring processso on. The method of formation of a generalized index of quality of measuring systems is proposed, which is valid for measuring systems of any type and various parameters being measured.
