Warranty Claims Reduction

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Appendix C: Worksheets

for Determining Root Cause

FORM C.1

Five- Whys Form

Note: e rst ve questions and answers are required. e additional questions and answers are

used if needed.

Line

Number State the nonconformance in specic terms

1.a. Why does this nonconformance exist?

1.b. Answer:

2.a. Why is the answer in line 1.b. the case?

2.b. Answer:

3.a. Why is the answer in line 2.b. the case?

3.b. Answer:

4.a. Why is the answer in line 3.b. the case?

4.b. Answer:

5.a. Why is the answer in line 4.b. the case?

5.b. Answer:

6.a. Why is the answer in line 5.b. the case?

6.b. Answer:

7.a. Why is the answer in line 6.b. the case?

7.b. Answer:

8.a. Why is the ...