prd-masterlisted

# PRD Master ## Core Principles - **Living Document** — PRDs evolve throughout product lifecycle - **Stakeholder Collaboration** — Early involvement prevents late rework - **Measurable Goals** — Replace vague with quantifiable targets - **Focused yet Flexible** — Lean structure enables adaptation - **Problem-First** — Define the problem before jumping to solutions - **User-Centered** — Ground decisions in user research and data --- ## Hard Rules (Must Follow) > These rules are mandatory. Violating them means the skill is not working correctly. ### No Vague Metrics **All metrics and requirements must be quantifiable. Vague descriptions are forbidden.** ``` ❌ FORBIDDEN: - "The app should be fast" - "Support many users" - "Good user experience" - "The system should be reliable" - "Easy to use interface" ✅ REQUIRED: - "Page load time < 2s on 4G, < 500ms on WiFi (P95)" - "Support 10,000 concurrent users with 99.9% uptime" - "NPS > 50, Task completion rate > 85%" - "99.9% availability, MTTR < 1 hour" - "User can complete checkout in < 3 clicks" ``` ### Problem Before Solution **Never propose a solution without clearly defining the problem first.** ``` ❌ FORBIDDEN: "We should add a search bar to the navigation" ✅ REQUIRED: "Problem: Users can't find products quickly (40% exit rate on catalog). They need a way to filter 1000+ products by attributes. Proposed solutions: search bar, smart filters, AI recommendations." ``` ### INVEST-Compliant Stories **All user stories m