Strong control is present throughout the full extent of a supply chain in the Automotive industry. OEM suppliers are to be compliant with customer standards and scrutiny and to be under rigorous control. The supplier has to prove that his process is under control and to guarantee that the delivered product will be according to customer expectations. A well-documented control plan represents all of the regulated characteristics of the product and the process, method and frequency of the inspection, as well as the reaction plan in case of a detected issue. However, in a realistic system, a control plan is not sufficiently effective. This paper presents the control plan development process, understandably with its flaws and shortcomings. The paper provides suggested improvements in order to neutralize the shortcomings and make the control plan more effective by providing the products fully conforming with the customer requirements, as well as more efficient by reducing resources spent, while guaranteeing the validity of the product.