Axiomatic approach to measurement theory is developed. All the possible statistical properties of apparatuses measuring an observable with nondegenerate spectrum allowed in standard quantum mechanics are characterized.
Comments: 9 pages, LaTeX, invited talk at 5th Int'l Conf. on Quantum Communication, Measurement and Computing (Capri, Iatly, July 3--8, 2000)
Journal: in Quantum Communication, Computing, and Measurement 3, edited by P. Tombesi and O. Hirota (Kluwer/Plenum, New York, 2001), pp. 97--106.
