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Root cause analysis


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Root cause analysis

  1. 1. SOFTWARE QUALITY ASSURANCEROOT CAUSE ANALYSIS Seminar: Oana FEIDI Quality Manager – Continental Automotive
  2. 2. WHAT IS ROOT CAUSE ANALYSIS? a class of problem solving methods aimed at identifying the root causes of problems or events
  3. 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
  6. 6. ROOT CAUSE METHODS : ISHIKAWAPeople Anyone involved with the processMethods How the process is performed and the specific requirements for doing it, such as policies, procedures, rules, regulations and lawsMachines Any equipment, computers, tools etc. required to accomplish the jobMaterials Raw materials, parts, pens, paper, etc. used to produce the final productMeasurements Data generated from the process that are used to evaluate its qualityEnvironment The conditions, such as location, time, temperature, and culture in which the process operates
  7. 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. 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
  9. 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)
  10. 10. ROOT CAUSE METHODS : 5 WHYCLASSIC EXAMPLE Benjamin Franklins 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. 11. EXERCISE Using the results from the previous exercise, now apply 5 Why method to identify the root cause
  12. 12. THANK YOU!