# Process Improvement (Lean & Six Sigma)

> USE THIS SKILL when the user asks about process improvement, Lean, Six Sigma, DMAIC, value stream mapping, waste reduction, process optimization, cycle time reduction, process KPIs, process maturity, or operational efficiency. Also trigger when someone mentions "8 wastes," "DOWNTIME," "kaizen," "continuous improvement," "bottleneck analysis," "quick wins," or requests an improvement roadmap for any operational process.

- Skill: `kaakati/process-improvement-lean-six-sigma` (Agent Skill)
- Install (CLI): `npx skillmds@latest add kaakati/process-improvement-lean-six-sigma`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kaakati/process-improvement-lean-six-sigma/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Product & Planning
- Author: Kaakati (https://skillmd.com/u/kaakati)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kaakati/process-improvement-lean-six-sigma

---


# Process Improvement (Lean & Six Sigma)

## Required Inputs

| Input | Description | Required? |
|-------|-------------|-----------|
| Process name and scope | The specific process or value chain to analyze | Yes |
| Current performance data | Cycle times, throughput, defect rates, costs, headcount | Yes |
| Business context | Industry, company size, competitive pressures | Yes |
| Pain points / triggers | Why improvement is needed now | Yes |
| Existing improvement history | Past initiatives, what worked, what failed | Recommended |
| Constraints | Budget, timeline, technology, regulatory, union/labor | Recommended |
| Stakeholder map | Process owner, sponsors, frontline operators | Recommended |

## Execution Steps

### Step 1: Process Maturity Assessment

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

| Dimension | 1 - Ad Hoc | 2 - Defined | 3 - Measured | 4 - Managed | 5 - Optimized |
|-----------|-----------|-------------|--------------|-------------|---------------|
| **Standardization** | No SOPs; tribal knowledge | SOPs exist but inconsistent | SOPs followed; exceptions tracked | SOPs regularly reviewed and updated | Continuous SOP optimization with feedback loops |
| **Measurement** | No metrics tracked | Basic output metrics only | Input + output metrics; dashboards exist | SPC applied; variation understood | Predictive analytics drive decisions |
| **Capability** | Untrained operators | Basic training programs | Certified operators; skill matrices | Cross-training; problem-solving culture | Autonomous teams driving improvement |
| **Technology** | Manual / paper-based | Basic IT support | Integrated systems; some automation | Advanced automation; real-time data | AI/ML-driven process optimization |
| **Management** | Reactive firefighting | Shift-level oversight | Daily management with escalation | Tiered daily management system | Self-correcting with exception-based management |
| **Continuous Improvement** | No CI activity | Suggestion boxes only | Structured kaizen events | CI embedded in daily work | Innovation pipeline with portfolio management |

**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:

| Waste | Definition | What to Look For | Quantification Method |
|-------|-----------|-------------------|----------------------|
| **D** - Defects | Errors requiring rework or scrap | Rework loops, scrap bins, error reports, customer complaints | Cost of rework labor + materials + warranty claims |
| **O** - Overproduction | Making more/sooner than needed | Excess inventory, forecasting buffers, "just in case" runs | Carrying cost of excess inventory + obsolescence risk |
| **W** - Waiting | Idle time between steps | Queue times, approval delays, system downtime, batch accumulation | Idle labor cost + opportunity cost of delayed throughput |
| **N** - Non-utilized talent | Underusing people's skills | Manual tasks that could be automated, no CI involvement, siloed roles | Productivity gap + turnover cost from disengagement |
| **T** - Transportation | Unnecessary movement of materials | Cross-building transfers, multiple handoffs, shipping to/from warehouse | Transport cost + damage/loss risk + time delay |
| **I** - Inventory | Excess raw, WIP, or finished goods | Warehouse space, aging stock, cash tied up, obsolescence write-offs | Carrying cost (typically 20-30% of inventory value annually) |
| **M** - Motion | Unnecessary movement of people | Walking, searching, reaching, excessive clicks in software | Time lost x labor rate |
| **E** - Extra processing | Doing more than customer requires | Over-engineering, redundant approvals, duplicate data entry | Labor cost of non-value-added steps |

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:

| Criteria | Quick Win | Not a Quick Win |
|----------|-----------|-----------------|
| Implementation time | < 90 days | > 90 days |
| Investment required | < $50K or within discretionary budget | Requires capital approval |
| Complexity | Single process / team | Cross-functional or system change |
| Risk | Low; easily reversible | High; difficult to reverse |
| Dependency | No dependency on other initiatives | Requires other projects first |

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

```markdown
# 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