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Root cause analysis

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Oana Feidi
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SOFTWARE QUALITY ASSURANCE ROOT CAUSE ANALYSIS Seminar: Oana FEIDI Quality Manager – Continental Automotive
WHAT IS ROOT CAUSE ANALYSIS?  a class of problem solving methods aimed at identifying the root causes of problems or events http://www.thinkreliability.com/Root-Cause-Analysis-CM-Basics.aspx
ROOT CAUSE METHODS : ISHIKAWA  are causal diagrams that show the causes of a specific event  an analyzing instrument which helps to identify, order and print possible causes of a specific problem or a quality characteristic  graphical representation of the relation between a result and all the factors that have impact http://www.isixsigma.com/tools-templates/cause-effect/cause-and-effect-aka-fishbone-diagram/
ROOT CAUSE METHODS : ISHIKAWA EXAMPLE http://www.chcr.brown.edu/pain/tools.htm
ROOT CAUSE METHODS : ISHIKAWA http://www.isixsigma.com/tools-templates/cause-effect/cause-and-effect-aka-fishbone-diagram/
ROOT CAUSE METHODS : ISHIKAWA People Anyone involved with the process Methods How the process is performed and the specific requirements for doing it, such as policies, procedures, rules, regulations and laws Machines Any equipment, computers, tools etc. required to accomplish the job Materials Raw materials, parts, pens, paper, etc. used to produce the final product Measurements Data generated from the process that are used to evaluate its quality Environment The conditions, such as location, time, temperature, and culture in which the process operates
EXERCISE  Identify possible causes for the following topics:  Group 1: Burned barbecue on 1st of May event  Group 2: Blurry pictures on the 1st of May event
ROOT CAUSE METHODS : 5 WHY  The 5 Whys is a question-asking technique used to explore the cause-and-effect relationships underlying a particular problem http://www.bulsuk.com/2009/07/5-why-analysis-using-table.html#axzz1u70e6jBm
ROOT CAUSE METHODS : 5 WHY  The vehicle will not start. (the problem)  Why? - The battery is dead. (first why)  Why? - The alternator is not functioning. (second why)  Why? - The alternator belt has broken. (third why)  Why? - The alternator belt was well beyond its useful service life and not replaced. (fourth why)  Why? - The vehicle was not maintained according to the recommended service schedule. (fifth why, a root cause)  Why? - Replacement parts are not available because of the extreme age of the vehicle. (sixth why, optional footnote)  Start maintaining the vehicle according to the recommended service schedule. (possible 5th Why solution)  Purchase a different vehicle that is maintainable. (possible 6th Why solution) http://en.wikipedia.org/wiki/5_Whys
ROOT CAUSE METHODS : 5 WHY CLASSIC EXAMPLE Benjamin Franklin's 5-Why Analysis: For want of a nail a shoe was lost, for want of a shoe a horse was lost, for want of a horse a rider was lost, for want of a rider an army was lost, for want of an army a battle was lost, for want of a battle the war was lost, for want of the war the kingdom was lost, and all for the want of a little horseshoe nail.
EXERCISE  Using the results from the previous exercise, now apply 5 Why method to identify the root cause
THANK YOU!

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Root cause analysis

  • 1. SOFTWARE QUALITY ASSURANCE ROOT CAUSE ANALYSIS Seminar: Oana FEIDI Quality Manager – Continental Automotive
  • 2. WHAT IS ROOT CAUSE ANALYSIS?  a class of problem solving methods aimed at identifying the root causes of problems or events http://www.thinkreliability.com/Root-Cause-Analysis-CM-Basics.aspx
  • 3. ROOT CAUSE METHODS : ISHIKAWA  are causal diagrams that show the causes of a specific event  an analyzing instrument which helps to identify, order and print possible causes of a specific problem or a quality characteristic  graphical representation of the relation between a result and all the factors that have impact http://www.isixsigma.com/tools-templates/cause-effect/cause-and-effect-aka-fishbone-diagram/
  • 4. ROOT CAUSE METHODS : ISHIKAWA EXAMPLE http://www.chcr.brown.edu/pain/tools.htm
  • 5. ROOT CAUSE METHODS : ISHIKAWA http://www.isixsigma.com/tools-templates/cause-effect/cause-and-effect-aka-fishbone-diagram/
  • 6. ROOT CAUSE METHODS : ISHIKAWA People Anyone involved with the process Methods How the process is performed and the specific requirements for doing it, such as policies, procedures, rules, regulations and laws Machines Any equipment, computers, tools etc. required to accomplish the job Materials Raw materials, parts, pens, paper, etc. used to produce the final product Measurements Data generated from the process that are used to evaluate its quality Environment The conditions, such as location, time, temperature, and culture in which the process operates
  • 7. EXERCISE  Identify possible causes for the following topics:  Group 1: Burned barbecue on 1st of May event  Group 2: Blurry pictures on the 1st of May event
  • 8. ROOT CAUSE METHODS : 5 WHY  The 5 Whys is a question-asking technique used to explore the cause-and-effect relationships underlying a particular problem http://www.bulsuk.com/2009/07/5-why-analysis-using-table.html#axzz1u70e6jBm
  • 9. ROOT CAUSE METHODS : 5 WHY  The vehicle will not start. (the problem)  Why? - The battery is dead. (first why)  Why? - The alternator is not functioning. (second why)  Why? - The alternator belt has broken. (third why)  Why? - The alternator belt was well beyond its useful service life and not replaced. (fourth why)  Why? - The vehicle was not maintained according to the recommended service schedule. (fifth why, a root cause)  Why? - Replacement parts are not available because of the extreme age of the vehicle. (sixth why, optional footnote)  Start maintaining the vehicle according to the recommended service schedule. (possible 5th Why solution)  Purchase a different vehicle that is maintainable. (possible 6th Why solution) http://en.wikipedia.org/wiki/5_Whys
  • 10. ROOT CAUSE METHODS : 5 WHY CLASSIC EXAMPLE Benjamin Franklin's 5-Why Analysis: For want of a nail a shoe was lost, for want of a shoe a horse was lost, for want of a horse a rider was lost, for want of a rider an army was lost, for want of an army a battle was lost, for want of a battle the war was lost, for want of the war the kingdom was lost, and all for the want of a little horseshoe nail.
  • 11. EXERCISE  Using the results from the previous exercise, now apply 5 Why method to identify the root cause