INCOSE Guide to Verification and Validation:
Purpose, Scope, and Content

The INCOSE Guide to Verification and Validation (V&V) is one of the International Council on Systems Engineering’s most important technical guides, providing authoritative, practical, and detailed direction on how to plan, execute, and manage verification and validation activities across the system life cycle.

As shown in Figure 1, the Guide complements and is aligned with the INCOSE Needs and Requirements Manual (NRM) in support of the INCOSE Systems Engineering Handbook (INCOSE SE HB) and the Systems Engineering Body of Knowledge (SEBoK) as well as standards such as ISO/IEC/IEEE 15288 and ISO/IEC/IEEE 29148. It complements by expanding the V&V processes into a deeper, more actionable body of knowledge for practitioners working on complex systems in any domain.

Figure 1: Relationships Among RWG Products

To better understand the context of the material presented in the Guide, the reader is encouraged to review the underlining concepts and activities within the NRM as well as the related guides: Guide to Needs and Requirements (GtNR) and the Guide to Writing Requirements (GtWR), and domain-specific guides such as the Guide to Security Needs and Requirements. Additional information is provided in the RWG Whitepaper Integrated Data as a Foundation of Systems Engineering. The GtWR is also supported by a useful Summary Sheet.

Purpose of the INCOSE Guide to Verification and Validation

The guide exists to bring clarity, consistency, and rigour to the practice of V&V. Its primary purposes include:

1. Establishing a Common Understanding of V&V

Verification and validation are often misunderstood or conflated. The guide clarifies:

Verification: “Did we build the system right?”

Validation: “Did we build the right system?”

By defining terminology, principles, and expected outcomes, the guide ensures that engineers, managers, and stakeholders share a common understanding of what V&V entails and why it matters.

2. Providing Practical, Actionable Guidance

Where the SE Handbook provides highlevel process descriptions, the V&V Guide dives into:

How to plan V&V

How to select methods

How to design tests

How to trace requirements to evidence

How to evaluate results and manage anomalies

Its purpose is to help practitioners do V&V effectively, not just understand it conceptually.

3. Supporting Quality, Safety, and Mission Success

V&V is essential for ensuring that systems:

Meet requirements

Are safe to operate

Perform reliably

Satisfy stakeholder needs

Comply with regulations

The guide provides the structure needed to reduce risk and increase confidence in system performance.

4. Enabling Tailored, Scalable V&V Approaches

The guide recognises that V&V must be adapted to system complexity, development model, and domain. It provides principles for tailoring V&V activities to:

Agile and iterative development

Model-based systems engineering (MBSE)

Softwareintensive systems

Hardwarecentric systems

Safetycritical domains

5. Supporting Professional Development and Organisational Maturity

The guide is widely used by organisations to:

Train systems engineers

Develop V&V capability

Improve process maturity

Support certification and audits

It is also a key reference for INCOSE certification candidates.

Scope of the INCOSE V&V Guide

The guide covers the full breadth of V&V activities across the system life cycle. Its scope includes:

1. All System Types

The guidance applies to:

Physical systems

Software systems

Cyberphysical systems

Service systems

Enterprise and sociotechnical systems

2. All Life Cycle Stages

The guide addresses V&V activities from early concept through disposal:

Concept validation

Requirements verification and validation

Architecture and design verification

Component and subsystem verification

Systemlevel verification

Operational validation

Sustainment and modification V&V

3. Processes, Methods, and Techniques

The guide covers a wide range of V&V methods, including:

Inspection and review

Analysis and modelling

Simulation

Demonstration

Testing (component, subsystem, system, acceptance)

Operational evaluation

4. Planning and Management

The guide provides detailed direction on:

V&V planning

Test strategy development

Requirements traceability

Evidence management

Anomaly reporting and resolution

Riskbased V&V

5. Integration with Other Disciplines

The guide explains how V&V interacts with:

Requirements engineering

Architecture and design

Specialty engineering (safety, reliability, human factors)

Project management

Configuration management

Content Overview

While the exact structure varies by edition, the INCOSE V&V Guide typically includes the following major sections:

1. Introduction to V&V

This section defines verification and validation, explains their importance, and describes how they fit into the systems engineering life cycle. It also introduces key concepts such as:

Requirements quality

Traceability

Evidencebased assurance

V&V roles and responsibilities

2. V&V Planning

A major portion of the guide is devoted to planning, including:

Developing a V&V strategy

Creating a V&V plan

Identifying required resources

Establishing success criteria

Integrating V&V with project schedules

The guide emphasises that effective V&V begins early and is integrated throughout development.

3. V&V Methods and Techniques

This section provides detailed descriptions of V&V methods, including:

Inspection: peer reviews, walkthroughs, audits

Analysis: mathematical modelling, static analysis, reliability analysis

Demonstration: functional demonstrations, prototypes

Test: unit, integration, system, acceptance, regression

Simulation: digital twins, MBSEbased simulation

For each method, the guide describes:

Purpose

Strengths and limitations

Typical inputs and outputs

When to use it

4. Requirements Verification and Validation

The guide provides deep guidance on:

Ensuring requirements are correct, complete, and testable

Tracing requirements to V&V activities

Managing derived and nonfunctional requirements

Validating stakeholder needs

5. Conducting V&V

This section covers the execution of V&V activities:

Preparing test environments

Conducting tests and demonstrations

Collecting and analysing data

Managing anomalies and deviations

Documenting results

6. V&V in Different Life Cycle Models

The guide explains how to adapt V&V for:

Waterfall

Incremental

Agile

Spiral

Hybrid models

7. V&V in Specialty Domains

Many editions include domainspecific guidance, such as:

Safetycritical systems

Missioncritical systems

Softwareintensive systems

Humanmachine systems

8. Appendices and Reference Material

These often include:

Templates

Checklists

Example V&V plans

Glossaries

Mappings to standards (e.g., ISO/IEC/IEEE 15288, DO178C, MILSTD810)

Why the INCOSE V&V Guide Matters

The guide is widely valued because it:

Provides practical, detailed guidance beyond what standards offer

Helps organisations reduce risk and improve system quality

Supports regulatory compliance in safetycritical industries

Strengthens requirements quality and traceability

Enables consistent, repeatable V&V practices

Supports professional development and certification

For systems engineers, test engineers, and project managers, it is one of the most important resources for ensuring that systems are built correctly and meet the needs they were intended to satisfy.