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This paper presents an adaptive  T 2control chart for monitoring shifts in the mean vector of a multivariate normally distributed process. This chart which combines the double sampling, variable sample size and variable sampling interval features, called the DSVSSI  T 2chart and uses three different sample sizes, two different sampling intervals, two warning limits and two different control limits. A Markov chain approach is employed to compute the statistical performance measures. The proposed chart is compared with the existing standard  T 2and other adaptive multivariate  T 2charts. In all cases, the DSVSSI  T 2chart is quicker at detecting small to moderate shifts in the mean vector. An example is provided to illustrate the construction and implementation of the DSVSSI  T 2chart. Finally, some concluding remarks are given.

A double sampling multivariate T 2 control chart with variable sample size and variable sampling interval