The CMS Muon system

The Compact Muon Solenoid Muon system, designed to trigger and identify muons, is based on three different technologies; drift tube (DT) in the barrel region, cathode strip chamber (CSC) in the endcap and resistive plate chambers (RPC) in both the barrel and endcap. The three subsystems, the local muon trigger and the global muon trigger will be described here giving some results obtained during the quality control tests. The chambers installation is now underway; the strategy adopted for the commissioning of the muon system will be described in this paper.