Process Improvement (Lean & Six Sigma)

Process Improvement (Lean & Six Sigma)

Required Inputs

Execution Steps

Step 1: Process Maturity Assessment

Score the current process across 6 dimensions on a 1-5 scale:

Maturity Score = Average across 6 dimensions. Interpret as:

• 1.0-2.0: Foundational — focus on standardization and basic measurement first
• 2.1-3.0: Developing — ready for structured Lean deployment
• 3.1-4.0: Competent — ready for Six Sigma and advanced analytics
• 4.1-5.0: Leading — focus on sustaining and innovating

Step 2: Value Stream Mapping (Current State)

Document the end-to-end process with these data points at each step:

For each process step, capture:

1. Process time (PT) — time actually working on the item
2. Lead time (LT) — total elapsed time including waiting
3. Changeover time (C/O) — time to switch between variants
4. Uptime / availability — percentage of scheduled time the step is operational
5. First-pass yield (FPY) — percentage of units passing without rework
6. Headcount — people required
7. Batch size — units processed before moving downstream
8. Inventory / WIP — units waiting between this step and the next

Calculate summary metrics:

• Total Process Time = Sum of all PT
• Total Lead Time = Sum of all LT (including queue times)
• Process Cycle Efficiency (PCE) = Total Process Time / Total Lead Time (target: >25% for service, >10% for manufacturing is typical starting point)
• Rolled Throughput Yield (RTY) = Product of all FPY values
• Takt Time = Available time / Customer demand rate

Step 3: Waste Identification (DOWNTIME Framework)

Systematically identify the 8 wastes of Lean at each process step:

For each identified waste instance:

• Estimate annual cost in dollars
• Estimate time consumed per unit/transaction
• Rate ease of elimination: Easy / Medium / Hard
• Rate impact if eliminated: Low / Medium / High

Step 4: DMAIC Analysis (for Six Sigma-Level Issues)

Apply DMAIC to the top 3-5 problems identified:

Define:

• Problem statement (specific, measurable, bounded)
• Project scope (in-scope / out-of-scope)
• Goal statement with target metric and timeline
• Business case (cost of the problem annually)

Measure:

• Identify CTQ (Critical to Quality) characteristics
• Establish measurement system (gauge R&R if applicable)
• Collect baseline data (minimum 30 data points)
• Calculate process capability (Cp, Cpk) or process sigma level

Analyze:

• Identify potential root causes (fishbone diagram / 5 Why)
• Validate root causes with data (hypothesis testing, regression, Pareto)
• Quantify contribution of each root cause

Improve:

• Generate solution alternatives (minimum 3 per root cause)
• Evaluate solutions using Pugh matrix or decision matrix
• Pilot solution with controlled implementation
• Validate improvement with before/after comparison

Control:

• Document new standard operating procedures
• Implement control charts or monitoring dashboards
• Create response plans for out-of-control conditions
• Transfer ownership to process owner

Step 5: Quick-Win Identification (< 90 Days)

Filter all improvement opportunities through the quick-win matrix:

Prioritize quick wins by: Impact ($) / Effort (person-days)

Step 6: ROI Calculation for Each Initiative

For every improvement initiative, calculate:

One-Time Costs:
  + Implementation labor (internal hours x loaded rate)
  + External consulting / contractor costs
  + Technology / equipment costs
  + Training costs
  + Change management costs
  = Total Investment

Annual Benefits:
  + Labor savings (hours freed x loaded rate)
  + Material / scrap savings
  + Throughput improvement (additional revenue capacity)
  + Quality improvement (reduced rework, warranty, returns)
  + Inventory reduction (one-time cash release + ongoing carrying cost savings)
  = Total Annual Benefit

ROI = (Annual Benefit - Annualized Cost) / Total Investment x 100%
Payback Period = Total Investment / Annual Benefit (months)
3-Year NPV = Sum of discounted annual benefits - Total Investment

Step 7: Build Improvement Roadmap

Sequence initiatives into three horizons:

• Wave 1 (0-90 days): Quick wins — no/low investment, immediate impact
• Wave 2 (3-12 months): Core improvements — moderate investment, structural changes
• Wave 3 (12-24 months): Transformational — significant investment, system/culture change

For each initiative in the roadmap, specify:

• Owner, timeline, resources needed
• Dependency on other initiatives
• Expected benefit ($ and time)
• Key milestones and decision gates
• Risk and mitigation

Output Template

# Process Improvement Assessment: [Process Name]

**Client:** [Name]
**Date:** [Date]
**Prepared by:** [Consultant]
**Process Scope:** [Start point] to [End point]

---

## 1. Executive Summary

[2-3 paragraphs: current state, key findings, total improvement opportunity in $ and %]

**Total Identified Waste:** $[X]M annually
**Achievable Savings (12-month):** $[X]M (XX% of waste)
**Required Investment:** $[X]M
**Expected ROI:** [X]%
**Payback Period:** [X] months

---

## 2. Process Maturity Assessment

| Dimension | Current Score (1-5) | Target Score | Gap |
|-----------|-------------------|--------------|-----|
| Standardization | | | |
| Measurement | | | |
| Capability | | | |
| Technology | | | |
| Management | | | |
| Continuous Improvement | | | |
| **Overall Maturity** | **[Avg]** | **[Target]** | **[Gap]** |

**Maturity Interpretation:** [Foundational / Developing / Competent / Leading]

---

## 3. Value Stream Map Summary

### Current State Metrics

| Process Step | Process Time | Lead Time | FPY | Headcount | WIP |
|-------------|-------------|-----------|-----|-----------|-----|
| [Step 1] | | | | | |
| [Step 2] | | | | | |
| ... | | | | | |
| **Total** | **[Sum PT]** | **[Sum LT]** | **[RTY]** | **[Total]** | **[Total]** |

**Process Cycle Efficiency (PCE):** [X]% (Target: [X]%)
**Takt Time:** [X] [units] per [period]
**Current Throughput vs. Demand:** [X]% utilization

### Future State Targets

| Metric | Current | Target | Improvement |
|--------|---------|--------|-------------|
| Total Lead Time | | | -XX% |
| Process Cycle Efficiency | | | +XX pp |
| Rolled Throughput Yield | | | +XX pp |
| Total Headcount | | | -XX FTEs |
| WIP Inventory | | | -XX% |

---

## 4. Waste Quantification Table

| # | Waste Type | Location | Description | Annual Cost ($) | Time per Unit | Ease | Impact |
|---|-----------|----------|-------------|----------------|---------------|------|--------|
| 1 | [D/O/W/N/T/I/M/E] | [Step] | [Detail] | $[X] | [X min/hrs] | [E/M/H] | [L/M/H] |
| 2 | | | | | | | |
| ... | | | | | | | |
| | | | **Total** | **$[X]** | | | |

### Waste by Category

| Waste Category | Annual Cost ($) | % of Total |
|---------------|----------------|------------|
| Defects | | |
| Overproduction | | |
| Waiting | | |
| Non-utilized Talent | | |
| Transportation | | |
| Inventory | | |
| Motion | | |
| Extra Processing | | |
| **Total** | **$[X]** | **100%** |

---

## 5. DMAIC Project Summaries

### Project 1: [Name]

| Phase | Key Finding / Action |
|-------|---------------------|
| **Define** | Problem: [X]. Goal: [metric] from [current] to [target] by [date] |
| **Measure** | Baseline: [X]. Process sigma: [X]. Measurement system validated: [Y/N] |
| **Analyze** | Root causes: [1, 2, 3]. Top contributor: [X] (XX% of variation) |
| **Improve** | Recommended solution: [X]. Pilot results: [X] |
| **Control** | Control method: [X]. Owner: [X] |

**Estimated Annual Benefit:** $[X]
**Implementation Cost:** $[X]

[Repeat for each DMAIC project]

---

## 6. Improvement Roadmap

### Wave 1: Quick Wins (0-90 Days)

| # | Initiative | Owner | Benefit ($/yr) | Investment ($) | Payback | Status |
|---|-----------|-------|----------------|---------------|---------|--------|
| 1 | | | | | | |
| 2 | | | | | | |

**Wave 1 Total:** $[X] benefit / $[X] investment

### Wave 2: Core Improvements (3-12 Months)

| # | Initiative | Owner | Benefit ($/yr) | Investment ($) | ROI | Dependencies |
|---|-----------|-------|----------------|---------------|-----|--------------|
| 1 | | | | | | |
| 2 | | | | | | |

**Wave 2 Total:** $[X] benefit / $[X] investment

### Wave 3: Transformational (12-24 Months)

| # | Initiative | Owner | Benefit ($/yr) | Investment ($) | ROI | Dependencies |
|---|-----------|-------|----------------|---------------|-----|--------------|
| 1 | | | | | | |
| 2 | | | | | | |

**Wave 3 Total:** $[X] benefit / $[X] investment

---

## 7. Investment Summary

| Horizon | Annual Benefit | Investment | ROI | Payback |
|---------|---------------|------------|-----|---------|
| Wave 1 (Quick Wins) | $[X] | $[X] | [X]% | [X] mo |
| Wave 2 (Core) | $[X] | $[X] | [X]% | [X] mo |
| Wave 3 (Transformational) | $[X] | $[X] | [X]% | [X] mo |
| **Total** | **$[X]** | **$[X]** | **[X]%** | **[X] mo** |

**3-Year NPV (@ [X]% discount rate):** $[X]

---

## 8. Risks and Dependencies

| Risk | Probability | Impact | Mitigation |
|------|------------|--------|------------|
| | H/M/L | H/M/L | |

---

## 9. Recommended Next Steps

1. [Immediate action with owner and deadline]
2. [Second action]
3. [Third action]

Quality Checks

• Every waste instance is quantified in both dollars and time — no qualitative-only waste items
• Process Cycle Efficiency is calculated and compared to industry benchmark
• Rolled Throughput Yield is calculated across the entire value stream, not just individual steps
• Quick wins are genuinely achievable in < 90 days with < $50K investment
• ROI calculation includes all cost categories (labor, materials, technology, training, change management)
• Each DMAIC project has a specific, measurable goal statement with baseline and target
• Improvement roadmap has clear sequencing with dependencies identified
• Maturity assessment scores are justified with observable evidence, not assumed
• Future state targets are realistic (not "eliminate all waste") and benchmarked
• Risk table includes mitigation actions, not just risk identification
• Payback periods are stated in months; NPV uses an appropriate discount rate
• No initiative lacks an assigned owner