The document describes the Vee model of systems engineering development. It outlines the key stages of the model including definition and decomposition at the top left, high level and detailed design in the lower left, implementation at the bottom, integration and testing in the lower right, and validation and verification in the upper right. Traceability and control gates are maintained throughout the process. The Vee model illustrates the relationships between early project phases and end results.

1. Vee
Development
Model
Adapted from Vee Model developed by Forsberg
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and Mooz Visualizing Project Management 1

2. Upper left side of Vee
 Definition and decomposition
 Systems engineering management plan (SEMP)
 Planning the technical development
 Control document for the project
Documents will be identified for the SEMP as we go
through the lessons
 Concept of operation
 Understanding the problem space
 The way the system is envisioned to work including the Operations and
Maintenance
 System level requirements
 “What” the system is to do to address the problem space
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3. Lower left side of the Vee
 Sub-system requirements (high level design)
 Transition from “what” the system must do to
“how” it is to be built.
 Sub-system definition and project level
architecture defined
 Interfaces identified
 Configuration Items Identified
 Component level – detailed design
 Software/hardware detailed design
 Code specifications
 Hardware specifications
 Configuration Items identified cont’
 Make-buy decisions
 Detailed design is equivalent to highway 100%
PS&E package
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4. Implementation (bottom of the Vee)
 Implementation
 Hardware and software development
 Systems Engineering Audit
 Code walk-through
 Commercial off the shelf (COTS) products implementation
(databases, object request broker, graphical user interface
(GUI) products)
 Hardware development (Printed Circuit (PC) Board
fabrication)
 Software Development
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5. Lower right side of the Vee
 Sub-system integration and testing
 Sub-system integration
 Legacy system integration
 External interface integration
 Sub-system test readiness
 Sub-system test procedures
 Component level integration and
testing
 Configuration item verification testing
 Module integration
 CI test procedures
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6. Upper right side of the Vee
 System commissioning – operations and maintenance
 Final crossover
 “Real-world” exposure
 Systems level validation
 Alpha testing
 Beta testing
 Evaluation period
 Training
 Limited “real-world” exposure
 Fall-back to previous baseline available
 Systems level integration and verification
 System level test procedures
 User documentation
 Verification testing under controlled environment
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7. Other aspects of the Vee
 Relationship across the Vee
 Verification and validation test
plans
 Control gates
 Formal technical reviews
 Traceability
 Requirements to test plan (across
the Vee)
 System to sub-system to design
(through the Vee)
 Baselines
 System baseline
 Subsystem baseline
 Design baseline
 Operational baseline
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8. The Vee Model View, Observations
 Has commercial and international acceptance
 Used by NHI for the Systems Engineering
Training
 Recommended for ITS Development
 Relationships of the Early phases of a project
to the End Results are clearly illustrated – A
powerful reality!
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