You can then correlate your test results to what happened in the production line that produced the parts. In manufacturing, you learn to do things right the first time. Mistakes of all kinds can disrupt the flow and introduce waste. That's the main reason why you document all your manufacturing procedures. Develop the organization Good manufacturing people are hard to find.
Manufacturing is hard work.
Furthermore, manufacturing is one of the more exacting jobs in the company because there's no room to hide errors or delays. When a product doesn't ship on time or doesn't work right, everyone in the company know about it. At New Focus, we were fortunate to start with top engineers who took an interest in business and wanted to get into manufacturing. We were strong in science and long on our culture of teamwork and customer focus, but low on specific manufacturing skills. We struggled to build the manufacturing system.