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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