Improve product quality and lower cost with the Sub-Tier Supplier Management Process Guideline. Developed to address common issues in the industry, this guideline defines the minimum quality-related requirements for Sub-Tier suppliers and provides explicit guidance on effective identification and control of Pass Through Characteristics (PTC). It also defines the minimum content for use in an organization's supplier risk and quality system assessments, and lists qualifications for supplier development "coaches", resulting in higher quality and lower cost to all members of the supply chain.