This document discusses defect causal analysis which aims to classify defects into categories and identify possible causes of defects. It outlines steps for analysis including classifying defects, identifying causes, and identifying solutions. Pareto analysis is discussed as a statistical technique to identify the few key causes that produce most of the problems. An example analysis is provided that shows the top defects found, their counts, and potential root causes to investigate like tools, training, people and processes. An action plan framework is presented to track preventative actions.

1. Defect Causal Analysis
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Md. Shamsul Haque
Project Manager
LEADS Corporation Limited

2. Defect Analysis:: WHAT
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Definition:
Defect analysis generally seeks to classify defects into categories and
identify possible causes of defects so that they can be prevented or
detected earlier
Classify defects into category
Identify causes of defects
Action to prevent

3. Defect Analysis:: WHY
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Decrease
Defects
Injected
Reduce
Rework Improve
Quality

4. Analysis to identify the main defect types
Analysis to identify the causes of defects
Identify solutions to attack the causes
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Defect Analysis:: How
User just wants to
make phone calls
listen music
share files

5. 5
Classify Causes of Defects
Problem/Errors/Defects
Causes
Type of Defect/Causes
DefectNumber
INTERFACE
DATA
LOGIC
INITIALIZATION
COMPUTATION

6. 6
Pareto Analysis
Statistical technique in decision-making used for the selection of a limited
number of tasks that produce significant overall effect.
Example:
1. 80% of customer complaints arise from 20% of your products and services
2. 20% of a systems defects cause 80% of its problems.
A large majority of problems (80%) are
produced by a few key causes (20%).

7. Pareto Analysis
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Error (Cause) /Defect type Count
Broken Links 349
Spelling Errors 169
Missing Title Tag 79
Missing Description Tag 77
Broken Image 45
Script Error 30
Incorrect Use of Headings 15
Missing ALT tags 14
Browser Compatibility 12
Security Warning 9

8. Cause Identification
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Broken Links
Tools/Techniques Training
People Process

9. 9
Action Plan
S.I Root Cause Preventive Action Responsibility Target Date of
Completion
Actual date of
Completion
Status