Glossary Updates12 new terms added to the glossaries · October 2, 2026, 22:44 CEST
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Glossary · System coordination, integration and orchestration

Subsystem integration

German: Subsystemintegration

In systems engineering, subsystem integration is the step-by-step assembly of subsystems into a higher-level system and the verification that their interfaces and interactions work as specified, before the complete system is integrated and verified.

  • System integration

In one sentence

Subsystem integration assembles subsystems step by step into a larger system and verifies their interfaces and interactions.

Example

The conveyor, the robot cell and the vision system are first integrated and tested as the handling subsystem before the handling subsystem is integrated with the packaging machine.

How it applies

  • Engineering: Plan the integration order (bottom-up, top-down or by function) and the test environment for each step, including simulators or stubs for subsystems that are not yet available.
  • Interfaces: Most integration problems are interface problems. Agreed Interface control document (ICD)s and early interface tests reduce surprises.
  • Verification: Each integration step ends with verification against the subsystem and interface requirements. Record results as part of the verification evidence.
  • Documentation: Subsystems from different suppliers bring their own documentation. The integrator must check that it is consistent (terminology, signal names, safety information) and complete it with documentation of the integrated subsystem.

Subsystem integration vs. system integration

Subsystem integration assembles parts into a subsystem or a larger intermediate unit. System integration is the overall process up to the complete system, including its interfaces to the environment. Subsystem integration steps are the building blocks of system integration.

By knowledge.aitechdoc.world · Published September 26, 2026 · Last reviewed

Source: AI TechDoc Blog editorial definition, based on ISO/IEC/IEEE 15288 and INCOSE Systems Engineering Handbook practice

Definitions follow the cited standards and specifications. Where a source is a copyrighted publication, such as an ISO, IEC or EN standard, the definition is a close paraphrase, not a verbatim quotation, so as not to infringe copyright. We recommend reading the original publication. The sections “How it applies” are editorial commentary by AI TechDoc Blog and are not part of any standard.

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