In this communi ation, we propose a tentative to set the fundamental problem of measuring process done by a large structure on a micros opic one. We consider the example of voting when an entire society tries to measure globally opinions of all so ial a tors in order to elect a delegate. We present a quantum model to interpret an operational voting system and propose an quantum approach for grading step of Range Voting, developed by M. Balinski and R. Laraki in 2007.