This document outlines the key stages in the V-model systems engineering process model. It begins with interpreting user needs and environmental constraints to develop system functional specifications and a verification plan at System Requirements Review. Then at Preliminary Design Review, the functional specifications are evolved into design specifications and verification plans for each component. Component and system level design, testing, verification and validation activities are then carried out at various stages like Critical Design Review, Test Readiness Review, System Verification Review and Post Deployment Review to demonstrate the system meets requirements.

1. INCOSE VEE and the IMP
Combine DT&E/O Demonstration`
System to Specified User Needs and
Environmental Constraints
Interpret User Needs, Refine System
Performance Specifications, and
Environmental Constraints
SRR
Develop System Functional Specifications
and System Verification Plan
SFR
Evolve Functional Performance
Specifications into CI Functional (Design To)
Specification and CI Verification Plans
PDR
System DT&E, Verify System
Functionality & Constraints Compliance
to Specifications
TRR
Integrated DT&E, Verify Performance
Compliance to Specifications CI
Verification DT&E
Evolve Functional Performance
Specifications into Product (Build To)
Documentation and Verification Plans
CDR Fabricate, Assemble, Unit Test to
Build To Documentation
Individual CI Verification DT&E
ASFUT GSFUT
System Integration System Demonstration
System Development and Demonstration
SVR PRR
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