1. Surroundings (Environment)
   1. Market Fluctuations: Variability in demand affecting supplier quality
   2. Regulatory Changes: New regulations impacting supplier processes
   3. Economic Conditions: Economic downturns reducing supplier investment in quality
2. Suppliers
   1. Quality of Raw Materials: Inconsistent raw material quality from suppliers
   2. Supplier Evaluation: Ineffective supplier evaluation and selection processes
   3. Delivery Times: Long or unreliable delivery times affecting quality
3. Systems
   1. Quality Control Systems: Inadequate quality control systems in place
   2. Feedback Mechanisms: Lack of effective feedback mechanisms to suppliers
   3. Documentation and Standards: Inconsistent documentation and adherence to standards
4. Skills
   1. Supplier Training: Insufficient training provided to suppliers on quality requirements
   2. Continuous Improvement: Limited focus on continuous improvement in supplier processes
   3. Technical Support: Insufficient technical support provided to suppliers