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A stamping process window is a set of ranges of the critical input variables in the process. Quality parts can be produced only if all of these variables fall within their respective ranges. To achieve this, the window has to be wide enough and the process properly located within the window. In this paper, various input variables in stamping are examined and the variables that have to be strictly controlled are identified. The establishment, transfer, adjustment, protection, deterioration and re-opening of stamping process windows are described. Examples from production are presented.