  The procedure of tossing quantum coins and dice is described. This case is an
important example of a quantum procedure because it presents a typical
framework employed in quantum information processing and quantum computing. The
emphasis is on the clarification of the difference between quantum and
classical conditional probabilities. These probabilities are designed for
characterizing different systems, either quantum or classical, and they,
generally, cannot be reduced to each other. Thus the L\"{u}ders probability
cannot be treated as a generalization of the classical conditional probability.
The analogies between quantum theory of measurements and quantum decision
theory are elucidated.
