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Fishbone Diagrams (cause and effect, or Ishikawa diagrams)

Fishbone Diagrams (cause and effect, or Ishikawa diagrams). John Ham OISM 470W. Overview (1 of 2). Definition Uses Ishikawa Use within organizations benefits Creation of the Diagram Steps 1-9. Overview (2 of 2). Example Service example Exercise Ham Industries.

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Fishbone Diagrams (cause and effect, or Ishikawa diagrams)

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  1. Fishbone Diagrams(cause and effect, or Ishikawa diagrams) John Ham OISM 470W

  2. Overview (1 of 2) • Definition • Uses • Ishikawa • Use within organizations • benefits • Creation of the Diagram • Steps 1-9

  3. Overview (2 of 2) • Example • Service example • Exercise • Ham Industries

  4. Fishbone (Cause and Effect or Ishikawa) Diagrams (1 of 4) • Named after Kaoru Ishikawa • Japanese Quality pioneer • Resembles skeleton of a fish • Focus on causes rather than symptoms of a problem • Emphasizes group communication and brainstorming • Stimulates discussion

  5. Fishbone (Cause and Effect or Ishikawa) Diagrams (2 of 4) • One of Seven basic tools of Japanese Quality • Leads to increased understanding of complex problems • Visual and presentational tool

  6. Fishbone (Cause and Effect or Ishikawa) Diagrams (3 of 4) • Typically done on paper or chalkboard • Recently some computer programs have been created to make Fishbone Diagrams • Ishikawa Environment

  7. Use in Organizations (1 of 2) • Can be used to improve any product, process, or service • Any area of the company that is experiencing a problem • Isolates all relevant causes

  8. Use in Organizations (2 of 2) • Helps bring a problem into light • Group discussion and brainstorming • Finds reasons for quality variations, and the relationships between them

  9. Creating Fishbone Diagrams (1 of 4) • As a group: 1. Establish problem (effect) -state in clear terms -agreed upon by entire group 2. Problem becomes the “head” of the fish -draw line to head (“backbone”)

  10. Creating a Fishbone Diagram (2 of 4) • Decide major causes of the problem - by brainstorming - if the effect or problem is part of a process the major steps in the process can be used 4. Connect major causes to backbone of the fish with slanting arrows

  11. Creating a Fishbone Diagram (3 of 4) 5. Brainstorm secondary causes for each of the major causes 6. Connect these secondary causes to their respective major causes 7. Repeat steps 5 & 6 for sub- causes dividing with increased specificity - usually four or five levels

  12. Creating a Fishbone Diagram (4 of 4) 8. Analyze and evaluate causes and sub-causes -may require the use of statistical, analytical, and graphical tools 9. Decide and take action

  13. Example (1 of 4) • Step 1 & 2: Poor Service (“backbone”) (“head”)

  14. Example (2 of 4) • Step 3 & 4: Responsiveness Appearance Poor Service Attention Reliability

  15. Example (3 of 4) • Step 5, 6, & 7: Responsiveness Appearance time equipment personnel facility Poor Service accuracy One on one service courtesy dependability Reliability Attention

  16. Example (4 of 4) • Step 8 & 9: • Use tools to analyze and evaluate causes • Pareto diagrams, charts, and graphs • Statistical analysis for causes in processes • Decide and take action • Use fishbone diagram, analysis and evaluations to find causes that can be fixed • Take action to eliminate and fix problem causes

  17. Exercise • Create a Fishbone (cause and effect, Ishikawa) Diagram for the following: Management at Ham Industries has noticed that the productivity of its workers is well below the standard. After interviewing its employees, it was noticed that a vast majority felt dissatisfied and unhappy with their work. Your boss has asked you and a group of your peers to find the causes of worker dissatisfaction . Include all possible causes to at least the secondary level.

  18. Summary (1 of 3) • Fishbone Diagrams - visual diagram - resembles fish skeleton - identifies the causes of a problem (effect), and their relationships - created by Kaoru Ishikawa for Quality Management

  19. Summary (2 of 3) • Organizational Uses • Increases communication about problems • Used to improve any product, process, or service • Important part of quality management

  20. Summary (3 of 3) • Creation of Fishbone diagrams • Problem or effect is head of fish • Identify major, secondary and tertiary causes, and attach to backbone identifying relationships • Analyze and Evaluate results • Act to fix the problem(s)

  21. Bibliography //home.t-online.de/home/kfmaas/q_ishika.html www.zi.unizh.ch/software/unix/statmath/sas/sasdoc/qc/chap17/sect1.htm www.dti.gov.uk/mbp/bpgt/m9ja00001/m9ja0000110.html Foster, S. Thomas. Managing Quality: An Integrative Approach. 2001, Prentice-Hall

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