Nucl. Instrum. Methods Phys. Res., A Nucl. Instrum. Methods Phys. Res., A 0167-5087 History plotting tool for data quality monitoring Giordano D CERN Le Bihan A C Strasbourg, IPHC Pierro A INFN, Bari De Mattia M Padua U. INFN, Padua 2010 617 263 265 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. research-article