# Decision Framework

> Thinking frameworks for decisions and problem analysis. Use when evaluating options, root causes, or prioritizing.

- Skill: `majiayu000/decision-framework-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/decision-framework-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/decision-framework-3/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/decision-framework-3

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# Decision Frameworks

| Situation | Framework |
|-----------|-----------|
| Challenge assumptions | First Principles |
| Find root cause | 5 Whys |
| Prioritize tasks | Eisenhower Matrix |
| Focus effort | Pareto 80/20 |
| Identify risks | Inversion |
| Map consequences | Second-Order Thinking |
| Compare options | Decision Matrix |

## Processes

**First Principles:** State problem → list assumptions → challenge each → identify fundamentals → build from truths.

**5 Whys:** State problem → ask "why?" iteratively → verify chain backwards → act on deepest cause.

**Eisenhower:** Urgent+Important (do), Not-Urgent+Important (schedule), Urgent+Not-Important (delegate), Neither (eliminate).

**Pareto:** List items → measure impact → sort → find ~20% driving ~80% → focus there.

**Inversion:** State goal → "what guarantees failure?" → list failure modes → invert into prevention.

**Second-Order:** Map effects → map what THOSE cause → find hidden costs → decide with full picture.

**Decision Matrix:** List options → weighted criteria → score each → sum → sanity check winner.