Along with the widespread use of Taguchi methods in product design, de nition of the loss function has been integrated with numerous models which require quality cost estimation. In this paper, the economic-statistical design of a variable sampling X-bar control chart is extended using the Taguchi loss function to improve chart effectiveness from a quality cost point of view. The effectiveness of the proposed schemes is evaluated by comparing optimal expected costs and statistical performance with each other and with the fi xed sampling policy. Results indicate a satisfactory performance for the proposed models.
