Section 39 of 103
38. System and Subsystem
Stable section ID: S05-CON-015-SECTION-39 · 5 content blocks
A System is an organized set of interacting entities that collectively perform one or more defined functions within an established boundary and environment.
A System is characterized by its purpose, boundary, elements, interfaces, relationships, inputs, outputs, states, constraints, dependencies, and lifecycle. Its behavior may include properties that do not belong to any individual component.
A Subsystem is a System that operates as a constituent of a higher-level System. It retains its own internal boundary and functions while contributing to the purpose of the parent System.
The classification of an entity as a System, Subsystem, or Component depends on the analytical context. The same entity may legitimately occupy different levels in different architecture views, provided that the applicable boundary is declared.
A Building System may include structural, enclosure, utility, digital, control, sensing, operational, and lifecycle subsystems. System decomposition shall preserve traceable interfaces and shall not conceal shared responsibilities or cross-system dependencies.