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+---
+name: 'step-03-risk-and-testability'
+description: 'Perform testability review (system-level) and risk assessment'
+nextStepFile: './step-04-coverage-plan.md'
+outputFile: '{test_artifacts}/test-design-progress.md'
+---
+
+# Step 3: Testability & Risk Assessment
+
+## STEP GOAL
+
+Produce a defensible testability review (system-level) and a risk assessment matrix (all modes).
+
+## MANDATORY EXECUTION RULES
+
+- 📖 Read the entire step file before acting
+- ✅ Speak in `{communication_language}`
+- 🎯 Base conclusions on evidence from loaded artifacts
+
+---
+
+## EXECUTION PROTOCOLS:
+
+- 🎯 Follow the MANDATORY SEQUENCE exactly
+- 💾 Record outputs before proceeding
+- 📖 Load the next step only when instructed
+
+## CONTEXT BOUNDARIES:
+
+- Available context: config, loaded artifacts, and knowledge fragments
+- Focus: this step's goal only
+- Limits: do not execute future steps
+- Dependencies: prior steps' outputs (if any)
+
+## MANDATORY SEQUENCE
+
+**CRITICAL:** Follow this sequence exactly. Do not skip, reorder, or improvise.
+
+## 1. System-Level Mode: Testability Review
+
+If **system-level**, evaluate architecture for:
+
+- **Controllability** (state seeding, mockability, fault injection)
+- **Observability** (logs, metrics, traces, deterministic assertions)
+- **Reliability** (isolation, reproducibility, parallel safety)
+
+**Structure output as:**
+
+1. **🚨 Testability Concerns** (actionable issues first)
+2. **✅ Testability Assessment Summary** (what is already strong)
+
+Also identify **ASRs** (Architecturally Significant Requirements):
+
+- Mark each as **ACTIONABLE** or **FYI**
+
+---
+
+## 2. All Modes: Risk Assessment
+
+Using `risk-governance.md` and `probability-impact.md` (if loaded):
+
+- Identify real risks (not just features)
+- Classify by category: TECH / SEC / PERF / DATA / BUS / OPS
+- Score Probability (1–3) and Impact (1–3)
+- Calculate Risk Score (P × I)
+- Flag high risks (score ≥ 6)
+- Define mitigation, owner, and timeline
+
+---
+
+## 3. Summarize Risk Findings
+
+Summarize the highest risks and their mitigation priorities.
+
+---
+
+### 4. Save Progress
+
+**Save this step's accumulated work to `{outputFile}`.**
+
+- **If `{outputFile}` does not exist** (first save), create it with YAML frontmatter:
+
+  ```yaml
+  ---
+  stepsCompleted: ['step-03-risk-and-testability']
+  lastStep: 'step-03-risk-and-testability'
+  lastSaved: '{date}'
+  ---
+  ```
+
+  Then write this step's output below the frontmatter.
+
+- **If `{outputFile}` already exists**, update:
+  - Add `'step-03-risk-and-testability'` to `stepsCompleted` array (only if not already present)
+  - Set `lastStep: 'step-03-risk-and-testability'`
+  - Set `lastSaved: '{date}'`
+  - Append this step's output to the appropriate section of the document.
+
+Load next step: `{nextStepFile}`
+
+## 🚨 SYSTEM SUCCESS/FAILURE METRICS:
+
+### ✅ SUCCESS:
+
+- Step completed in full with required outputs
+
+### ❌ SYSTEM FAILURE:
+
+- Skipped sequence steps or missing outputs
+  **Master Rule:** Skipping steps is FORBIDDEN.