Gráficos de controle com amostragem múltipla

The usual practice in using a control to monitor a process is to take only one sample from the process at each h hours. The multiple sapling allows to take more than one sample, if necessary, at each h1 hours, with h1>h. The result is that the control chart with multiple sampling takes samples more frequently when there is a change in the process and this process change can be detected much more quickly. The properties of control charts with multiple smapling are evaluated and the results extended to the nX chart and the np hcart. [In Portuguese.]