Introduction
Living systems do not merely exist—they actively sustain themselves.
Cells regulate their internal conditions, organisms respond to changing environments, and living systems across domains maintain the organisation required for their continued existence. This activity is not incidental. It is constitutive of life itself.
The APS framework captures this through the concept of biological agency.
Beyond Mechanism and Intentionality
Biological systems are often described in two contrasting ways.
On the one hand, they are treated mechanistically, as systems whose behaviour is fully explained by underlying physical processes. On the other, they are described in intentional terms, as if they pursue goals or make decisions.
Both perspectives capture something important, but neither fully explains the distinctive organisation of living systems.
Biological agency in APS avoids this dichotomy. It does not imply conscious intention or representation, but neither does it reduce living activity to passive mechanism.
Instead, it identifies the organised activity through which living systems sustain themselves.
Agency as Viability-Oriented Activity
In APS, biological agency is the viability-oriented, self-regulating activity through which a system sustains, modulates, and re-creates the conditions of its own persistence.
Living systems do not simply undergo change. They regulate the conditions under which they can continue to exist.
Agency is therefore not a structure, property, or capacity. It is an ongoing activity—what living systems do to keep going.
Life and Agency
Life and biological agency are not separate phenomena. They are the same organisation viewed from different perspectives.
- Life names the organised condition of persistence
- Agency names the activity that enacts and sustains that organisation
This distinction clarifies a central feature of living systems: persistence depends on what the system does.
Agency and Constraint Closure
Biological agency is grounded in constraint-closed organisation.
Living systems maintain networks of mutually sustaining constraints that preserve the conditions required for continued existence. Agency consists in the activity through which these constraints are sustained, reinforced, and reorganised.
Through this activity, systems differentiate changes relative to viability and act to maintain their coherence across time and scale.
Agency, Normativity, and — What Matters
Because living systems must sustain their organisation, not all states are equivalent. Some support persistence, while others undermine it.
Biological agency makes this difference operational. It is the activity through which systems respond to what matters for their continued existence.
Normativity is therefore not an added feature. It is intrinsic to biological agency: activity is organised in relation to viability.
Agency, Process, and Scale
In APS, biological agency is one dimension of a triad:
- Agency — viability-oriented regulation
- Process — the dynamic organisation of activity through time
- Scale — the coordination of activity across spatial and temporal domains
These are analytically distinguishable but ontologically co-constitutive. Each describes the same viability-oriented, constraint-closed organisation from a different perspective.
Agency is emphasised methodologically because it makes the normativity of living systems explicit.
Agency and Semiosis
In APS, semiosis is the lived expression of biological agency.
It consists in the real-time differentiation of what supports or threatens continued existence. Through semiosis, living systems register and respond to differences that matter for their persistence.
Agency provides the organisational condition for this activity. Semiosis is its minimal, observable expression.
Agency as Self-Maintaining Activity
Biological agency can be understood as recursive self-maintenance.
Living systems continuously regenerate the constraints required to remain within viable conditions. They do not simply remain stable; they actively re-establish the conditions under which stability is possible.
In this sense, biological agency is the organised activity through which persistence becomes something that matters to the system itself.
Agency and Evolution
Biological agency is not static. It is transformed across evolutionary time.
Evolution can be understood as the historical transformation of persistence-sustaining organisation. As such, it is the long-term transformation of biological agency across generations and environments.
This perspective connects present activity with the historical processes that have shaped it.
Why Biological Agency Matters
Clarifying biological agency helps resolve several key issues:
- Why living systems appear goal-directed without invoking intention
- Why biological activity cannot be reduced to passive mechanism
- How normativity arises within living systems
- How persistence is actively maintained
By identifying biological agency as viability-oriented activity, APS provides a naturalised account of purposiveness grounded in biological organisation.
Conclusion
Biological agency is the activity through which life exists.
Living systems persist because they actively sustain and regulate the conditions required for their own existence. This activity is not an additional feature of life—it is what life is.
In APS, biological agency makes explicit the viability-oriented organisation that defines living systems. It shows how persistence becomes an active, self-maintaining achievement enacted through process and coordinated across scale.