A method for use in a system for diagnosing the causes of manufacturing defects involves process characterization. The catch has a first fastening point for an upward pulling end of the pulling device and a second fastening point for a downward pulling end of the pulling device, which point is horizontally off-set from the first fastening point in the window pane plane when the window pane is fitted. In some implementations, user-specified ratings and alerts can be included in a route determination.