  A scope in quality control, which has recently received a great deal of
attention is profile that characterizes the quality of a product or process by
a relationship between two or more variables. In this paper, we propose an EWMA
chart for phase II monitoring of multivariate simple linear profile in which
several correlated response variables have linear relationships with one
explanatory variable. The statistical performance of this scheme is evaluated
in terms of out-of-control average run length. Although it seldom signals for
small shifts, it is superior to previous works in detecting moderate and big
shifts.
