ISO 27026:2023

Overview

ISO 27026:2023 - Space systems - Programme management - Breakdown of project management structures - defines processes, requirements and guidance for creating and managing project breakdown structures used in space programmes. The standard covers the composition and relationships of hierarchical breakdowns such as the specification tree, function tree, product tree, work breakdown structure (WBS), cost breakdown structure (CBS), business agreement breakdown structure, and organizational breakdown structure (OBS). It is applicable at the programme top level (level 0) and for individual projects, and can be used by independent developers or as the basis of supplier–customer agreements.

Key technical topics and requirements

• Types of breakdown structures: Describes the common trees (specification, function, product, WBS, CBS, business agreement, OBS) and how they contribute to project control and traceability.
• Hierarchical tree model: Requires a tree-like organizational framework for each breakdown structure so lower-level elements relate to higher-level nodes and interfaces are identified.
• Relationships and flow-down: Specifies how requirements at level 0 flow into level 1 specifications and cascade into function and product trees, and how WBS and CBS map to tasks and costs.
• Composition and tailoring: Provides requirements and recommendations for composing, tailoring and iterating breakdown structures across programme stages to manage scope, risk and resources.
• Contract and supplier context: Explains use for supplier–customer arrangements and subcontracting (level 1, level 2, etc.), including the use of a business agreement breakdown structure to represent subcontract relationships.
• Purpose and outcomes: Emphasizes traceability of requirements to products, identification of tasks and resources, cost relationships, and organizational accountability.

Practical applications

• Establishing a consistent WBS, CBS and OBS for budgeting, scheduling and resource planning in satellite and launch projects.
• Ensuring requirements traceability from top-level customer needs down through specifications, functions and product elements.
• Defining subcontract boundaries and responsibilities via a business agreement breakdown structure during procurement and supply-chain management.
• Tailoring project structure during phase transitions (design, integration, launch, operations) to control risk, costs and schedules.
• Improving cross-organizational communication and reducing programmatic risk by standardizing project breakdown practices.

Who should use ISO 27026:2023

• Space programme and project managers
• Systems and requirements engineers
• Cost and schedule planners (PMO, EVM analysts)
• Contracting officers, suppliers and prime contractors
• Risk and configuration managers involved in complex space systems

Related standards

• ISO 14300-1 - Structuring of a project (higher-tier standard referenced by ISO 27026)
• ISO 23462 - Guidelines to define the management framework for a space project
• ISO 10795 - Space systems programme management vocabulary

Keywords: ISO 27026, project breakdown structures, WBS, CBS, OBS, specification tree, function tree, space programme management, space systems standards.