How To Ensure Your Long-Term Suppliers' CONTINUOUS Quality Compliance (Ⅱ) How to watch for the quality capability of a supplier’s product realization process (Continued from the last issue)
How can we evaluate whether products continuously produced by a supplier can meet the quality requirements, in other words, can the quality of the supplier’s products be kept stable and satisfactory to the customer?
▼ Understand the production process, with focuses on the main processes that affect the product quality; ▼ Pay attention on-site to whether the main processes are implemented according to the process requirement, whether there are any operation deviations, and whether the inspection records meet the requirements; ▼ More importantly, watch out for process risks while focusing on process execution compliance. This writer once visited the production site of a formula mixing process at a brake pad factory. The process was to weigh and mix nearly 20 different chemical raw materials according to the requirements of the formula. For the brake pad production, the mixing process not only is labor-intensive and quite dusty but also requires a strong sense of responsibility. Moreover, it is a very confidential process. Being the lifeline of the enterprise generally, the process is usually operated by the owners, their relatives, or trusted employees, while other employees and outsiders are not allowed to enter the control room. According to this writer’s on-site observations, there were more than 20 material bins on the left side, and each bin was also marked with stored materials. On the right side, there were purchased raw materials, with the names, addresses, and telephone numbers of the manufacturers on the bags. The operator needed to put the purchased raw materials into the bins with the corresponding names on the bins which were equipped with the function of opening the door when a QR code was scanned. The operator had a piece of paper on which the 20 or so QR codes were printed. When adding the raw materials into the bins, the operator would scan one of the QR codes printed on the paper, go to the right side to get the purchased raw material, pour the material into the bin with the open door and then manually close the door, and he would go through this process with all the materials. This writer checked the on-site operation instructions, the feeding time, feeding amount, and other documents and records, and didn’t find any problems. He then asked the operator, “so you follow this process every time you add the materials into the bins. What if you put the raw materials into other bins by mistake?” The operator answered: “I have been working here for years and have never made any mistakes. My boss trusts me deeply. And I can tell all the materials here without even looking at the markings on the bags.”
The operator’s narrative, the on-site records, and operations all seemed flawless and the process apparently was in compliance with the requirement. However, from the perspective of the process risk, with the operator leaning on the boss' blind trust and years of experience on his job, there are very high risks with this process. For example, with all QR codes printed together on a single piece of paper, there was no guarantee that the correct QR code was selected in the first place. The process, therefore, is very likely to produce non-conforming products. Obviously, when we look at the process capability of suppliers, we should also pay more attention to the risks of process quality. Helping suppliers to avoid the risk is an important part of sustainable quality stability. (To be continued) |