I suggest you first step back and consider the most appropriate global sourcing strategy. There should be no automatic assumption that China is the optimal manufacturing location. I often discuss Rightshoring with my clients, calculating total cost of ownership (TCO), and the overall global sales strategy before determining the global supply chain map. You may find the trend towards regional manufacturing, close to your customers, is more suitable. Here is a web link to an excellent free total cost of ownership calculator, that takes into account all potential cost factors. http://www.reshorenow.org/tco-estimator/ Regarding contract manufacturers, it is important to work through a documented strategic sourcing supplier qualification and selection process. It is critical to partner with a contract manufacturer whose core competencies,management culture, and strategic direction are in alignment.