Review the following Use Case #3: Managing Supplier Quality: Integrated Devices (from page 839 of the book that I attach in the link: https://drive.google.com/file/d/14DyRVPHBrgwB7LZGBnBwSKL6VZ7NIYGD/view?usp=sharing, The case begins with Bill Edwards is a quality engineer assigned to the Injected Molding Commodity Team
at Integrated Devices. The commodity team is responsible for evaluating, selecting, and
negotiating agreements with plastic-injected molding suppliers to be used throughout
Integrated Devices. The team is also responsible for improving service quality and material
that Integrated Devices receives from its suppliers. Bill's role after supplier selection
involves working directly with suppliers that require training or technical assistance
concerning quality control and quality improvement.)  and respond to the following questions, please add your point of view and recommendations, your responses should be in essay form. 

Why is it important to prove that a process is proven capable before developing statistical control limits (i.e., SPC charts)?

Discuss the possible advantages of negotiating quality requirements directly into supplier contracts.

Why was it so important for Bill to work with Plant No. 3 personnel before visiting Trexler?

Include in-text citation and references.