Fault Identification in Batch Processes Using Process Data or Contribution Plots: A Comparative Study∗∗Work supported in part by Project PFV/10/002 (OPTEC Optimization in Engineering Center) of the Research Council of the KU Leuven, Project KP/09/005 (SCORES4CHEM) of the Industrial Research Council of the KU Leuven, and the Belgian Program on Interuniversity Poles of Attraction initiated by the Belgian Federal Science Policy Office. The authors assume scientific responsibility.