The following represents the financial information for Domingo Corporation for two months.

March April
Sales revenue $ 490,000 $ 440,000
Costs Process inspection $ 1,550 $ 1,960
Scrap 1,800 2,020
Quality training 19,400 12,100
Warranty repairs 4,400 4,800
Product testing equipment 6,700 7,000
Customer complaints 3,000 3,400
Rework 18,000 19,500
Preventive maintenance 14,900 9,700
Materials inspection 6,600 4,800
Field testing 8,600 13,500

Required: Classify these items into Prevention, Appraisal, Internal failure, or External failure costs.