In many instances, the cost is high to monitor primary quality characteristics called performance variable, but it could be economical to monitor its sur- rogate. To cover asymmetric processes for two-stage charting methods using both performance and surrogate variables, bivariate skew normal distribution is considered as the underlying distribution of process variables. When the correlation relationship between the performance variable and its surrogate is specified, a charting procedure to monitor either the performance variable or its surrogate in an alternating fashion rather than monitoring the per- formance variable alone is proposed. The proposed two-stage control charts are constructed under an economic design using Markov chain approach. Its advantages over the existing methods will be presented.
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