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In the present contribution we discuss the role of experimental limitationsin the classical limit problem. We studied some simple models and found thatQuantum Mechanics does not re-produce classical mechanical predictions, unlesswe consider the experimental limitations ruled by uncertainty principle. Wehave shown that the discrete nature of energy levels of integrable systems canbe accessed by classical measurements. We have defined a precise limit for thisprocedure. It may be used as a tool to define the classical limit as far as thediscrete spectra of integrable systems are concerned.

Quantum Noise and its Importance to the Quantum Classical Transition Problem: Energy Measurement Aspects