This study presents a flowchart to direct the choice of control chart and capability indices for processes with response variables: (i) uncorrelated, (ii) correlated dependent control variables, and (iii) autocorrelated. The use of the flowchart was illustrated by applying it to the hard turning process of an agricultural machinery company. The process was monitored by control charts for multiple regression, and its capability was assessed using capability indices to control charts based on regression models. The results of these indices were compared with the traditional capability indices.
Statistical process control; Regression control chart; Process capability indices
