Part of the series: APS and Contemporary Theories

This article examines a major framework in biology or cognition and shows why it does not fully account for life as viability-oriented, constraint-closed organisation. For the positive account, see What Is Life?.

The Autopoiesis Insight

Autopoiesis marked a turning point in theoretical biology by shifting attention from components to organisation. Living systems were no longer defined by what they are made of, but by what they do: continuously produce and maintain themselves as a unity.

APS fully endorses this shift.

However, identifying life with autopoiesis alone leaves something important unexplained.

What Autopoiesis Explains Well

Autopoiesis captures that living systems:

  • produce and maintain their own components
  • sustain organisational identity through internal processes
  • are defined by organisation rather than external function

These insights remain foundational.

The Limitation: Closure Without Viability

Autopoiesis explains self-production.

It does not fully explain why:

  • failure matters to the system
  • breakdown is existential
  • persistence must be actively secured

Self-production alone does not yet establish viability-oriented normativity.

Self-Production Is Not Yet Agency

A system may produce its own components and still lack:

  • active regulation of its conditions
  • responsiveness to perturbation
  • reorganisation under stress

APS therefore distinguishes:

  • self-production (necessary)
  • agency (sufficient for life)

Constraint Closure Extends Autopoiesis

APS reframes this difference through constraint closure.

Constraint closure requires that:

  • processes maintain the constraints that enable them
  • regulation preserves the capacity to regulate
  • breakdown threatens continued existence

This grounds viability and normativity more explicitly than autopoiesis alone.

The APS Perspective

Autopoiesis identifies a crucial feature of life.

APS extends it.

Life is not simply self-producing organisation. It is:

viability-oriented, constraint-closed organisation sustained through ongoing activity

Key Point

Autopoiesis explains how systems produce themselves, but life is defined by the activity through which systems must sustain the conditions of their own continued existence.