An enhancement for single sampling plan method

Acceptance sampling has been widely used as a quality control technique in industry. A standard single sampling plan consists of 3 switchable inspection plans: Tightened, Normal and Reduced [1]. It means the 3 inspection schemes can be switched from one to another based on predetermined successive products´ quality. Theoretically, higher quality of successive lots or batches has high probability of acceptance, and vice versa, lower quality of products will suffer from high reject ratio. However, how about the switch rule works? How to adjust the switch rule to meet requirements of manufacturing and cost? In this paper, we simulate the acceptance probability with different class of defects or defectives in a standard single sampling plan using a self-developed program. And using this program, we investigate the actual inspection cost and both producers´ and consumers´ risk with a variety of switch rule. An optimized single sampling plan is proposed based on the results of design of experiment (DOE). The sampling plan is more economic and effective to manufactories.