Control chart nowadays can be used not only for monitoring activity but also for performance measurement, forecasting, maintenance, and others. Economic design of control chart represents one method to analyze control chart. The method determines control chart with its economic value from cost value during monitoring activity when it takes place. The Economic comparison could be used to determine optimal parameter like amount of sample, specification of correct standard, and minimum total expenses. PT XYZ is a manufacturing industry, which produces commercial vehicle of XXX. It takes place in industial area of Pulo Gadung. To be survive among competitors, the company should pay more attention to quality which conformance to consumers. This research designs control chart for company by considering the actual condition that happened at the company. Total expected cost value of control chart equals to Rp. 4.939.841,15 per cycle, or equals to Rp. 148.193,27 per period. Then searched considering of that total cost to find optimal solution which give lower expense. The result of calculation got three alternatives of optimal solution. The three solutions is chosen later by examination using three analysis. Through the analysis, it will be able to get one optimal solution which most conducive and earn as according to requirement of company. At this research is also enhanced economic design of control chart when company apply six-sigma concept. Keywords: Statistical Quality Control, Economic Design of Control Chart, Automotive Spare-part Sidiky Achmad K dan Betrianis; Departemen Teknik Industri, Fakultas Teknik Universitas Indonesia, Kampus Baru UI Depok, Jawa Barat 16424, Email : betrianis@ie.ui.ac.id ; sidikyachmadkarim00@ie.ui.ac.id
