Classify the following quality costs as prevention costs, appraisal costs, internal failure costs, or external failure costs:

1. Internal audit to ensure that quality guidelines and processes are being followed

2. Repairing products in the field 3. Providing engineering assistance to selected suppliers to improve their product quality

4. Correcting a design error discovered during product development

5. Settling a bodily injury law suit caused by a defective product

6. Customer complaint department 7. Quality control circles

8. Continuing supplier verification

9 Redesigning a product to eliminate a product defect

10 Lost sales because of product quality concerns