Giordano, D Le Bihan, A C Pierro, A De Mattia, M Nucl. Instrum. Methods Phys. Res., A 10.1016/j.nima.2009.06.109 263-265 617 1-3 2010 2010 The size and complexity of the CMS detector makes the Data Quality Monitoring (DQM) system very challenging. Given the high granularity of the CMS sub-detectors, several approaches and tools have been developed to monitor the detector performance closely. We describe here the History DQM, a tool allowing the detector performance monitoring over time.