Approach to create the Key Performance Indicators (KPIs)
- Start with Problem Statement – Identify what the improvement objectives that the Six Sigma teams set off to accomplish (e.g., reduce costs, improve customer satisfaction, shorten lead times).
- Translate Problem Statement into Critical-to-Quality (CTQ) Requirements – CTQs are measurable characteristics that are essential for customer satisfaction.
- Define Key Metric Categories
- Quality (Defects & Errors)
- Defects per Million Opportunities (DPMO)
- Cost of Poor Quality (COPQ)
- First Pass Yield (FPY)
- Efficiency (Cycle Time & Productivity)
- Process cycle time
- Throughput rate
- On-time delivery %
- Customer Satisfaction
- Net Promoter Score (NPS)
- Customer complaints per unit/transaction
- Service level agreement (SLA) adherence
- Financial Impact
- Savings from defect reduction
- Rework/return costs
- ROI on Six Sigma projects
- Quality (Defects & Errors)
- Define the KPI Formula & Measurement
- Every KPI should have:
- Definition (what exactly is measured)
- Formula (how it’s calculated)
- Data source (where numbers come from)
- Target/benchmark (what “good” looks like)
- Example KPI:
- Name: Defects Per Million Opportunities (DPMO)
- Formula: (Total Defects ÷ (Units × Opportunities per Unit)) × 1,000,000
- Target: < 3.4 DPMO (Six Sigma standard)
- Every KPI should have:
- Review & Adjust – KPIs should evolve as processes improve. Regularly review whether they still reflect business goals.
Quick Examples of Six Sigma KPIs
- DPMO = < 50
- Customer complaints reduced by 30% in 6 months
- First Pass Yield > 95%
- Cycle time reduced from 10 days to 7 days
- COPQ reduced by $200K annually
Sample KPIs tracking list
| KPI Name | Definition | Formula | Target | Control Limits | Frequency | Data Source | Owner |
|---|---|---|---|---|---|---|---|
| Defects Per Million Opportunities (DPMO) | Measures process defects | (Defects ÷ (Units × Opportunities)) × 1,000,000 | < 100 | UCL = 150, LCL = 50 | Monthly | Quality system | QA Manager |
| Cycle Time | Avg. time from order to delivery | (Delivery Date – Order Date) | ≤ 7 days | UCL = 8, LCL = 5 | Weekly | ERP system | Process Owner |
| Preventive Maintenance Compliance | % of planned maintenance completed | (Completed ÷ Planned) × 100 | ≥ 95% | UCL = 100%, LCL = 90% | Weekly | Maintenance logs | Maintenance Lead |
