ISO IEC IEEE 21839-2019 PDF

Full title and description

ISO/IEC/IEEE 21839:2019 — Systems and software engineering — System of systems (SoS) considerations in life cycle stages of a system. A joint ISO/IEC/IEEE international standard that presents a concise set of SoS-focused considerations and questions to be addressed at key points in the life cycle of a system of interest (constituent system) that will operate within one or more systems of systems.

Abstract

ISO/IEC/IEEE 21839:2019 provides structured, life-cycle‑aligned considerations for engineers, program managers and stakeholders building systems that will interact as constituent systems within systems of systems (SoS). The document maps SoS concerns to life‑cycle stages (Concept, Development, Production, Utilization & Support, Retirement), groups issues into Capability, Technical and Management areas, and identifies information artifacts and potential actions to address risks and realize benefits. It is informative in nature (sets questions and considerations) and does not prescribe specific methods, tools or documentation formats.

General information

• Status: Active / Valid international standard
• Publication date: 19 July 2019 (board approval 13 June 2019; project approval 17 February 2017)
• Publisher: Joint publication by ISO, IEC and IEEE (ISO/IEC/IEEE)
• ICS / categories: 35.080 — Software (Software development and system documentation)
• Edition / version: First edition (2019)
• Number of pages: 31 (catalog listings vary slightly by publisher/format; some show up to 34 pages)

Scope

The standard addresses system‑of‑systems considerations that apply to a constituent system (the system of interest, SoI) at each life‑cycle stage. It is intended for human-made systems that may include hardware, software, people, procedures and facilities, and is applicable to one‑of‑a‑kind, mass‑produced or adaptable systems. The scope focuses on identifying what stakeholders should consider (capability, technical and management aspects), the likely risks and benefits of addressing or not addressing them, and the types of information or artifacts that can support decision making. The document explicitly does not define detailed methods, procedures or mandated documentation formats.

Key topics and requirements

• SoS terminology and concepts: constituent system, SoI, SoS characteristics (operational/managerial independence, emergence, evolution).
• Life‑cycle alignment: mapping SoS considerations to ISO/IEC/IEEE 15288 and ISO/IEC/IEEE 24748 stages (Concept, Development, Production, Utilization & Support, Retirement).
• Stage‑specific checklists of considerations grouped by Capability, Technical and Management concerns.
• Identification of information items/artifacts that answer SoS questions (interfaces, configuration data, operational constraints, maintenance plans, etc.).
• Guidance on assessing benefits and risks of addressing (or failing to address) SoS considerations at each stage.
• Discussion of the SoS technical base (elements that enable or constrain interactions among constituent systems).
• Limitations: informative only — does not mandate methods, metrics, or documentation formats.

Typical use and users

Primary users include systems engineers, systems‑of‑systems architects, program and project managers, technical leads, acquisition/procurement teams and systems integrators who design, develop, field or sustain systems intended to operate as part of larger SoS. The standard is also useful to regulators, certification bodies and stakeholders who need to evaluate whether SoS aspects were considered across a system’s life cycle.

Related standards

Closely related standards and normative context include ISO/IEC/IEEE 15288 (system life cycle processes), ISO/IEC/IEEE 24748 (life cycle management guidance), ISO/IEC/IEEE 12207 (software life cycle processes), and companion SoS standards such as ISO/IEC/IEEE 21840 (guidelines for utilization of 15288 in SoS context) and ISO/IEC/IEEE 21841 (taxonomy of systems of systems). Other relevant documents cover requirements engineering and assurance (for example ISO/IEC/IEEE 29148 and related assurance guidance).

Keywords

system of systems, SoS, constituent system, system of interest (SoI), life cycle stages, systems engineering, SoS considerations, interoperability, emergent behavior, capability, lifecycle management, ISO/IEC/IEEE 15288

FAQ

Q: What is this standard?

A: ISO/IEC/IEEE 21839:2019 is an international guidance standard that lists considerations and questions to address when a system is intended to operate as a constituent system within one or more systems of systems (SoS), aligned to life‑cycle stages.

Q: What does it cover?

A: It covers SoS‑relevant considerations mapped to life‑cycle stages (Concept, Development, Production, Utilization & Support, Retirement), grouped into Capability, Technical and Management concerns, and identifies supporting information items and potential actions. It does not prescribe specific methods or document formats.

Q: Who typically uses it?

A: Systems engineers, SoS architects, program managers, integrators, procurement and sustainment teams, and evaluators or regulators who need to ensure SoS issues are considered during system development and fielding.

Q: Is it current or superseded?

A: The 2019 publication is the current (first) edition. Users should check national or publisher catalogues for any amendments or later revisions before assuming currency for procurement or compliance activities.

Q: Is it part of a series?

A: Yes — it is part of an SoS family of documents coordinated with system/software life‑cycle standards (notably ISO/IEC/IEEE 15288 and 24748) and companion SoS standards such as ISO/IEC/IEEE 21840 and 21841.

Q: What are the key keywords?

A: system of systems, constituent system, system of interest, life cycle, systems engineering, interoperability, emergent behaviour, capability, configuration, utilization, retirement.