I would think there are many points to consider when selecting a vendor to outsource a specific aspect of a product. One of the most important factors I believe should be considered is the quality of the product. This includes all of the features that the device or end product will depend on to maintain the design specifications. Some examples of these features may include density, tensile strength, biocompatibility, etc. In addition to providing the quality and features needed to support the end product, the PM would also have to consider the cost of the item, as well as its availability. These factors play a large role in the profit margin of the product.