> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bluegenai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Phase 2: Requirements Refinement & CAB

> Orient yourself to Phase 2 and find the path that matches your context.

Requirements Refinement is the second phase of the Government Project Lifecycle. It's where structured, traceable requirements are produced from raw inputs — whether those inputs are solicitation materials or a legacy system.

The output of Phase 2 is a set of approved user stories, acceptance criteria, and supporting documentation that drives Phase 3: System Design.

## Why Phase 2 has two paths

* **Path A** is for Business Analysts working from solicitation materials and discovery notes after contract award.
* **Path B** is for government offices or contracted teams who need to reverse-engineer an existing legacy system before they can write requirements for its replacement — this is the primary entry point for the modernization scenario. Path B uses CAB (Common Application Blueprint) as its primary tool.

## Choose your path

<CardGroup cols={2}>
  <Card title="Path A: Post-Award Requirements Development" icon="file-lines" href="/building-web-apps/phase-2-path-a">
    You have a contract, discovery findings, and are developing requirements from solicitation materials and stakeholder input.
  </Card>

  <Card title="Path B: Legacy System Modernization (CAB)" icon="arrows-rotate" href="/building-web-apps/phase-2-path-b">
    You have a legacy system that needs to be understood before requirements can be written — you need to know what it does before you can define what its replacement should do.
  </Card>
</CardGroup>

<Tip>
  Not sure which applies? If you're writing requirements from a contract and discovery materials, use Path A. If you're starting from an existing system that needs to be understood first, use Path B.
</Tip>