In the Warning Letter Report 2011, statistics have been published about FDA’s Warning Letters (issued to drugs and API manufacturers) during the fiscal year 2011 (from October 2010 to September 2011). The topics Process Validation / Qualification haven’t been considered separately. In the following, you will find a summary from the 39 Warning Letters 2011 on GMP deviations regarding Process Validation, Qualification and Calibration in the manufacturing environment.