What procedures does the supplier have for quality control and quality assurance?

What procedures does the supplier have for quality control and quality
assurance?
Are quality problems and corrective actions documented?
Flexibility How flexible is the supplier in handling changes in delivery schedules, quantity,
and product or service changes?
Location Is the supplier nearby?
Price Are prices reasonable given the entire package the supplier will provide?
Is the supplier willing to negotiate prices?
Is the supplier willing to cooperate to reduce costs?
Product or service
changes