Chart Assistant Based upon collected process metrics data determines whether process is in control using statistical methods

Chart Assistant On one chart plot –User’s data point –Mean (Am) –Upper and lower natural limits (UNPL and LNPL) –+1 and -1 standard deviations

Chart Assistant On the second chart plot –Differences between consecutive data points –Mean (mR) –Upper control limit (UCL)

Chart Assistant Process is out of control, if the following is true –single metrics values lies outside UCL –single metrics values lies outside UNPL and LNPL –2 out of 3 consecutive metrics values lie more than 2 std. deviations away from Am –4 out of 5 consecutive metrics values lie more than 1 std. deviation away from Am –8 consecutive metrics values lie on one side of Am

Chart Assistant Chart plotted screen no data points entered data points entered change data no data entered enter data plot chart remove all data