Institutions are often identified with organisations, offices, buildings, laws, or systems of governance.

APS interprets institutions more fundamentally as distributed constraint systems.

Institutions stabilise expectations, regulate interactions, and preserve coordinated activity across populations and through time.

Importantly, institutions are not reducible to any particular person, organisation, or physical structure.

Institutional continuity depends upon networks of practices, norms, symbolic systems, procedures, and expectations that participants continually reproduce.

Institutions therefore function as continuity architectures through which social organisation becomes increasingly stable and historically extended.

Institutions persist because organisms continually reproduce the constraints that sustain them.