7QC Tools — Histogram
Cause & Effect Diagram – Root Cause Analysis Tool
Why Problems Keep Reappearing
Surface-level fixes address symptoms, not causes — problems return because the true root causes were never identified or eliminated.
Recurring operational issues that reappear despite repeated corrective actions
Defects reappearing after fixes because root causes were never truly identified
Incomplete problem investigation that addresses symptoms rather than causes
Multiple hidden contributing factors interacting across people, machines, and materials
Inefficient troubleshooting processes that waste time and resources
The Concept
How Fishbone Diagrams Reveal Root Causes
Maps all potential causes visually in structured categories
Enables systematic investigation across people, machines, methods, and materials
Prevents overlooking hidden contributing factors
Supports team-based problem solving with cross-functional input
Our Approach
Cause & Effect Analysis Framework
01
Problem Definition
Clearly define the operational problem or defect to be investigated — the 'effect' at the head of the diagram.
02
Cause Identification
Brainstorm all potential causes across the 6M categories using team knowledge and data.
03
Cause Categorization
Organise identified causes into structured categories on the fishbone branches.
04
Root Cause Validation
Verify which causes are true root causes using data analysis, testing, and evidence.
05
Process Improvement Actions
Implement targeted corrective and preventive actions to eliminate validated root causes.
The 6M Framework
Common Cause Categories in Root Cause Analysis
Man (People)
Investigate operator skills, training levels, experience, and human factors that contribute to the problem.
Machine (Equipment)
Examine equipment condition, maintenance history, calibration status, and capability limitations.
Method (Process)
Review standard operating procedures, work instructions, process parameters, and workflow design.
Material (Inputs)
Analyse raw materials, components, supplier quality, specifications, and material handling practices.
Measurement (Inspection)
Assess measurement systems, gauges, inspection methods, calibration, and data collection accuracy.
Environment (Conditions)
Consider temperature, humidity, lighting, cleanliness, workplace layout, and environmental factors.
Integrated Approach
Integration with Quality Improvement Tools
Business Impact
Operational Benefits of Root Cause Analysis
Faster Root Cause Identification
Structured investigation pinpoints true causes instead of chasing symptoms.
Reduced Problem Recurrence
Eliminating root causes prevents operational issues from reappearing.
More Effective Corrective Actions
Targeted fixes address actual causes, improving first-time resolution rates.
Improved Troubleshooting Efficiency
Systematic approach reduces investigation time and resource waste.
Stronger Continuous Improvement Culture
Teams learn to think systematically about problems and their underlying causes.
Industries Using Cause & Effect Analysis
Manufacturing Operations
Automotive Production
Engineering Industries
Electronics Manufacturing
Process Industries
Service Process Improvement
How We Work
How We Conduct Root Cause Analysis
Problem Investigation Assessment
Review current problem-solving practices and identify opportunities for structured root cause analysis.
Cause & Effect Diagram Development
Facilitate structured fishbone diagram sessions with cross-functional teams.
Root Cause Validation
Use data analysis and testing to verify which causes are true root causes.
Process Improvement Recommendations
Translate validated root causes into effective corrective and preventive actions.
FAQs
Frequently Asked Questions
What is a Cause & Effect diagram?
A Cause & Effect diagram — also known as a Fishbone or Ishikawa diagram — is a visual tool that systematically maps all potential causes of a specific problem or effect. Causes are organised into categories (typically the 6Ms) branching from a central spine, resembling the skeleton of a fish.