Cause effect diagram

Cause effect diagram

1. © Sun Technologies Inc. 1 Cause and Effect Diagram

2. © Sun Technologies Inc. 2 What is Cause and Effect Analysis? Cause and Effect Analysis is a technique for identifying all the possible causes (input condition) associated with a particular problem / effect (output condition).

3. © Sun Technologies Inc. 3 Cause and Effect Analysis is a valuable tool for : Focusing on causes not symptoms Providing a picture of why an effect is happening Establishing a basis for further data gathering and action Cause and Effect Analysis can also be used to identify all of the areas that need to be tackled to generate a positive effect. Why use Cause and Effect Analysis

4. © Sun Technologies Inc. 4 What is a Cause and Effect Diagram? A Cause and Effect diagram (also known as a Fishbone or Ishikawa diagram) graphically illustrates the results of the analysis and is constructed in steps. Cause-and-Effect diagrams graphically display potential causes of a problem The layout shows Cause-and-Effect relationships between the potential causes.

5. © Sun Technologies Inc. 5 Why use a Cause and Effect Diagram? It is common for people working on improvement efforts to jump to conclusions without studying the causes, target one possible cause while ignoring others, and take actions aimed at surface symptoms Cause-and-effect diagrams are designed to: Providing a structure to understand the relationships between many possible causes of a problem Giving people a framework for planning what data to collect Serving as a visual display of causes that have been studied Helping team members communicate within the team and with the rest of the organization

6. © Sun Technologies Inc. 6 How do I do it? Identify the Problem/Issue Select a particular problem, issue or effect. Make sure the problem is specific, tightly defined and relatively small in scope and that everyone participating understands exactly what is being analysed. Write the problem definition at the top.

7. © Sun Technologies Inc. 7 How do I do it? (continued) Draw fishbone diagram Place the effect at the head of the “fish” Include the 6 recommended categories shown below Problem or Issue Method Machine Environment Measurement System People Material

8. For Example © Sun Technologies Inc. 8 Finding Cause for Blurry photo:

9. The resulting diagram illustrates the main causes and sub-causes leading to an effect. Analyse the diagram and i dentify the root cause of the effect that is been noted. Solve the problem by examining the root cause . © Sun Technologies Inc. 9 How do I do it? (continued)

10. Reference © Sun Technologies Inc. 10 http:// www.airccse.org/journal/mvsc/papers/3212ijmvsc02.pdf http:// www.academicjournals.org/journal/AJBM/article-full-text-pdf/AA1143816550 http:// asq.org/learn-about-quality/cause-analysis-tools/overview/fishbone.html