# DfLSS Measure Phase - Quick Reference Card
## Feature 004: Test Performance Baseline

---

## 🎯 Key Metrics at a Glance

| Metric | Value | Status |
|--------|-------|--------|
| **Total Tests** | 1,178 | ✅ Baseline |
| **Mean Time** | 0.774ms | ✅ Within SLO |
| **Std Dev** | 0.876ms | ⚠️ High |
| **CV** | 113.22% | ❌ HIGH (>30%) |
| **Cpk** | 0.294 | ❌ INADEQUATE (<1.0) |
| **Outliers** | 21 (1.78%) | ⚠️ Investigate |
| **Process Control** | IN CONTROL | ✅ Stable |

---

## 📊 Statistical Summary

```
Distribution:
  Min: 0.10ms | Q1: 0.35ms | Median: 0.61ms | Q3: 0.86ms | Max: 8.28ms

Percentiles:
  P95: 2.27ms | P99: 5.66ms

Control Limits:
  X-bar: LCL=0.35ms | CL=1.51ms | UCL=2.66ms
  Range: LCL=0.00ms | CL=2.00ms | UCL=4.23ms
```

---

## 🔍 Variation Sources (Pareto 80/20)

1. **I/O Operations** → 35% (file, RDF parsing)
2. **Network Calls** → 20% (marketplace API)
3. **Test Complexity** → 15% (integration, swarm)
4. **Sequential Execution** → 10% (dependencies)

**Total**: 80% of variation from 4 root causes

---

## 🎯 Process Capability

| Index | Current | Target | Gap |
|-------|---------|--------|-----|
| **Cp** | 1.90 | >1.33 | ✅ Met |
| **Cpk** | 0.29 | >1.33 | ❌ -78% |

**Sigma Level**: ~0.9σ (Target: 6σ)
**DPMO**: 308,538 (Target: <3.4)

---

## ⚡ Immediate Actions

1. **Profile 21 Outlier Tests** (>3σ)
   - Use `cargo flamegraph`
   - Identify I/O/network bottlenecks

2. **Categorize Tests**
   - Unit: <1ms (68% of tests)
   - Integration: <5ms (21%)
   - E2E: <10ms (7%)
   - Property: <2ms (4%)

3. **Set SLO Baselines**
   - P95 by category
   - Track monthly

---

## 📈 Improvement Roadmap

### Short-Term (Sprint)
- Investigate outliers
- Tag test categories
- Establish SLO monitoring

### Medium-Term (Phase 2)
- Mock I/O → -30% variation
- Mock network → -20% variation
- Parallelize tests → -10% variation
- **Target Cpk**: 0.80+

### Long-Term (6 months)
- CV: 113% → <30%
- Cpk: 0.29 → >1.33
- Outliers: 1.78% → <0.27%

---

## 🎓 Workshop Learning

**Principle**: "You cannot improve what you cannot measure"

✅ Quantitative baseline established
✅ Statistical control confirmed (stable process)
✅ High variation identified (assignable causes)
✅ Improvement targets set (Cpk >1.33)

**Next Phase**: Analyze (Root Cause Analysis, FMEA)

---

## 📄 Full Report

`/Users/sac/ggen/specs/004-optimize-test-concurrency/dflss/STATISTICS_VARIATION_ANALYSIS.md`

---

**Generated**: 2025-12-11
**Process Owner**: ggen Test Suite
**DfLSS Phase**: Measure → Analyze (Next)
