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skills/lean-analyst/SKILL.md

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+---
+name: lean-analyst
+description: Lean Software Development methodology framework — provides MVP definition criteria, feature prioritization matrix, assumption validation methods, and phase breakdown rules. Activated automatically by lean, lean-user-research, and lean-analyze-usage. Trigger phrases: "lean methodology", "mvp framework", "feature prioritization lean".
+---
+
+## Overview
+
+Provides Lean Software Development methodology for analyzing ideas and defining MVPs. Core reference for the lean, lean-user-research, and lean-analyze-usage skills.
+
+## When to Use
+
+- Invoked automatically during lean analysis
+- When applying lean methodology to MVP definition
+- When prioritizing features using value vs effort matrix
+- When planning phase breakdown for a project
+
+## Don't Use When
+
+- IPA documentation already exists and implementation is ready to begin
+- Only a quick command reference is needed
+
+## The 7 Lean Principles (Mary Poppendieck)
+
+| # | Principle | Application |
+|---|-----------|-------------|
+| 1 | Eliminate Waste | Only build features with proven user value |
+| 2 | Amplify Learning | Validate assumptions early, iterate fast |
+| 3 | Decide as Late as Possible | Keep options open until necessary |
+| 4 | Deliver as Fast as Possible | Smallest valuable increment first |
+| 5 | Empower the Team | Trust team decisions |
+| 6 | Build Integrity In | Quality from start |
+| 7 | See the Whole | Optimize whole system, not parts |
+
+## 7 Wastes in Software Development
+
+| Waste | How to Eliminate |
+|-------|------------------|
+| Partially Done Work | Smaller batches, complete before starting new |
+| Extra Features | Validate need before building |
+| Relearning | Document decisions (D-xx in SRD) |
+| Handoffs | Cross-functional teams |
+| Task Switching | Focus on one thing at a time |
+| Delays | Remove blockers proactively |
+| Defects | Quality built in, early testing |
+
+## MVP Definition
+
+```
+MVP = Minimum + Viable + Product
+
+Minimum: Smallest feature set
+Viable:  Actually solves the problem
+Product: Can be used by real users
+```
+
+MVP Checklist:
+- [ ] Solves a real user problem
+- [ ] Has clear success metrics
+- [ ] Can be built in reasonable time
+- [ ] Assumptions are identified
+- [ ] Validation plan exists
+
+## Feature Prioritization
+
+| Priority | Criteria | Action |
+|----------|----------|--------|
+| P1 | Core value, must have for launch | Build in MVP |
+| P2 | Important, enhances value | Build after MVP validation |
+| P3 | Nice to have | Defer, validate need first |
+| P4 | Future consideration | Document, don't build |
+
+## Assumption Validation Methods
+
+| Type | Example | How to Validate |
+|------|---------|-----------------|
+| Problem | Users have this pain | User interviews |
+| Solution | Our approach works | Prototype testing |
+| Market | People will pay | Landing page test |
+| Technical | We can build it | Spike/POC |
+
+## Phase Breakdown Rules
+
+| Features | Recommended Phases |
+|----------|-------------------|
+| 1-3 P1 features | 1 phase |
+| 4-6 P1 features | 2 phases |
+| 7+ P1 features | 3+ phases (consider re-scoping) |
+
+## Lean → IPA Mapping
+
+| Lean Output | IPA Input |
+|-------------|-----------|
+| Problem Statement | SRD Section 2 (Objectives) |
+| MVP Features | SRD Section 4 (Feature List) |
+| Target Users | SRD Section 3 (User Roles) |
+| Assumptions | SRD Section 14 (Key Decisions) |
+| Out of Scope | SRD Section 2 (exclusions) |
+
+## Data Analysis Integration
+
+### Pre-Build (User Research)
+
+| Method | When to Use |
+|--------|-------------|
+| Persona Development | Before lean |
+| Journey Mapping | Before ipa-bd |
+| Competitor Analysis | Before MVP definition |
+
+### Post-Build (Usage Analytics)
+
+| Method | When to Use |
+|--------|-------------|
+| Behavioral Analysis | After launch |
+| Funnel Analysis | Optimization phase |
+| Cohort Analysis | Growth phase |
+
+## Workflow Integration
+
+```
+lean-user-research → docs/USER_RESEARCH.md
+    ↓
+lean → MVP definition (data-informed)
+    ↓
+ipa-bd → UI_SPEC.md (with design rationale)
+    ↓
+Launch → Collect usage data
+    ↓
+lean-analyze-usage → Improvement insights
+    ↓
+lean [improvement] → Next iteration
+```