Tree Diagram Example

Tree Diagram Example

Problem Statement

Create a tree diagram for the number of quality issues for a given product.

#

Notes

1

Product volumes (A: 72%, B: 18%, C: 5%, D: 5%)

2

Complaints (Initial Quality: 24, Reliability: 3, Durability: 2, Other: 1)

3

Region with issues (USA: 18, Europe: 8, Asia: 2, Other: 2)

4

Type of customer (Large Hospital: 11, Medium: 9, Small: 10)

5

Experience with company(High: 15, Low: 14, Other: 1)

How to perform analysis 

Step 1: Open Sigma Magic

  1. Click on the Sigma Magic button on the Excel toolbar.
  2. Click on the New button to create a new project.
Step 2: Add the analysis template
  1. Click on the Tool Wizard to add the analysis template.
  2. Click on Project and then Tree Diagram.


Step 3: Specify analysis options
A new worksheet will be added to your workbook. Analysis Setup will be automatically opened, in the setup tab specify the following details.



Click on the Checklist button, you will see the following dialog box. Ensure that the items mentioned in checklist should be marked.




Step 4: Enter the Worksheet data
Click on Create button to save all changes and compute the outputs for this analysis.On the worksheet, enter the following details. A sample worksheet is given below:




Step 5: Generate analysis results
Finally, click Analysis Setup and then click on Verify tab to ensure all the inputs are okay and shown in a green checkmark.


Interpreting Results

  Problem Focus: The primary focus of this analysis is to "Reduce the number of quality issues (defects) with the products." This overarching objective is then narrowed down through the tree diagram.

  Dominant Product Category: The "Product Category" split reveals that "Prod A" constitutes 72% of the issues. This makes it the prime target for improvement efforts. The justification given is that "Prod A is the biggest selling item," implying a higher volume of sales could naturally lead to a higher number of reported issues.

  Critical Quality Category: The "Quality Category" split points to "Initial Product Quality" as the most significant contributor to defects. This suggests a problem originating early in the product lifecycle, potentially during manufacturing or initial setup. The reason provided, "Most complaints are for initial product quality," reinforces this finding.

  Key Geographical Region: The "Region" split highlights "USA" as the area with the most pronounced quality issues. This localization of the problem allows for targeted interventions and resource allocation. The reasoning, "Biggest customer base & span of control is here," suggests that the USA's high sales volume and established operational presence make it a logical focal point for improvement initiatives.

  Refined Problem Statement: Based on the above splits, the problem statement is refined to "Reduce the initial product quality issues for Prod A in the USA region." This specific definition allows for focused problem-solving and targeted solutions.

  Potential Next Steps: The diagram provides a solid foundation for further investigation. The next logical steps might include:

  • Root Cause Analysis: Investigate why "Prod A" suffers from "initial product quality" issues in the USA. Tools like fishbone diagrams or 5 Whys can be employed.
  • Process Improvement: Identify specific areas in the production or distribution process of "Prod A" in the USA that contribute to quality defects.
  • Data Collection: Gather more detailed data on the types of defects, their frequency, and potential contributing factors.
  • Solution Implementation: Develop and implement solutions targeted at the identified root causes.
  • Monitoring and Evaluation: Track the effectiveness of implemented solutions and make adjustments as needed.


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