Abstract

This article situates APS in relation to major contemporary approaches in biology, cognition, systems theory, and organisational science. APS treats these frameworks not as simply competing theories, but as partial explanatory orientations illuminating different dimensions of viability-oriented organised persistence sustained across time. The framework therefore develops a continuity-oriented explanatory grammar capable of integrating mechanistic, ecological, cognitive, evolutionary, informational, and organisational approaches within a unified account of how living systems regulate continuity, adapt to perturbation, and sustain viability through ongoing transformation across interacting scales and timescales.

APS and Contemporary Theories

Understanding Biological Explanation Across Frameworks

Contemporary biology possesses extraordinary explanatory power, yet its major theoretical frameworks often remain only partially integrated.

Genetics, systems biology, autonomy theory, enactivism, ecological theory, cognitive science, evolutionary theory, information theory, and organisational biology

each illuminate important dimensions of living systems while frequently relying upon different assumptions concerning what life fundamentally is.

Some approaches emphasise:

information processing;
predictive regulation;
self-production;
distributed systems dynamics;
cognition;
evolutionary selection;
emergence;
or adaptive control.

Each captures something important.

None, however, fully explains what makes a system a living system in the first place.

APS Box — How APS Relates to Other Theoretical Frameworks

Contemporary frameworks such as control theory and nonlinear dynamical systems theory provide powerful and indispensable accounts of living systems. They explain how systems regulate their behaviour, maintain stability, and exhibit complex dynamics across time.

APS does not replace these approaches, nor does it reduce them to a single underlying model. Instead, it addresses a different question: what kind of organisation makes a system a living system in the first place.

Multiple theoretical frameworks can therefore apply to the same system, but they do so in different ways and address different explanatory questions. A dynamical systems description may characterise the system’s trajectories, and a control-theoretic model may describe its regulatory structure. These accounts are often non-reducible to one another, and each can be independently valid.

However, such accounts do not by themselves distinguish living systems from non-living systems. Many non-living systems also exhibit regulation, feedback, and complex dynamics.

APS contributes by specifying the organisational conditions under which a system must actively maintain its own viability. A system is viability-oriented when its processes are organised such that their effects contribute, directly or indirectly, to maintaining the conditions required for the system’s continued existence.

Importantly, in APS, viability is not defined by reference to life itself. It is specified in terms of the persistence of an organised system within a bounded region of possible states. A living system is therefore not defined in a circular sense as “that which maintains viability”, but as a system whose organisation is structured around maintaining these conditions.

In this sense, APS provides a way of identifying what makes a system a living system, rather than a general account of everything such a system does.

This does not mean that APS provides a complete or self-sufficient account of living systems. Describing how such systems behave, regulate, and evolve requires additional theoretical frameworks. APS specifies conditions that are necessary for identifying living systems, but it does not by itself exhaust the explanations required to understand them.

A complete scientific understanding of living systems therefore requires multiple forms of explanation. Dynamical and control-theoretic accounts explain how systems behave and regulate. APS clarifies the conditions under which such systems count as living systems at all.

Key Point:
Explaining regulation, dynamics, or behaviour is not the same as explaining what makes a system a living system. APS addresses this latter question by specifying the organisational conditions under which viability is maintained.

APS approaches this fragmentation through a different explanatory starting point:

viability-oriented organised persistence sustained across time.

The central question therefore becomes:

What kind of organisation must exist for any biological process, mechanism, information flow, adaptive behaviour, predictive regulation, or cognitive activity to count as part of a living system at all?

From this perspective, contemporary theories are not simply right or wrong.

They are:

partial explanatory orientations;
partial continuity perspectives;
and partial analyses of organised persistence.

Each captures important dimensions of how living systems sustain continuity, while often elevating one organisational aspect into a complete account of life itself.

APS instead attempts to situate these insights within a broader explanatory grammar grounded in:

viability;
continuity;
persistence;
perturbation-sensitive regulation;
constraint closure;
and scale-integrated organised transformation.

Where this article fits: This article situates APS comparatively in relation to neighbouring frameworks in biology, cognition, systems theory, and philosophy of biology. Its purpose is not to present the full APS framework, defend organisational realism, or reconstruct biological intelligibility in general, but to clarify how APS integrates, constrains, extends, and reorganises insights from existing theoretical approaches within a continuity-oriented explanatory architecture. For the broader philosophical reconstruction of APS, see APS as Philosophy — A Viability-Oriented Account of Biological Reality. For the formal explanatory structure of APS, see The Explanatory Geometry of Biology — How APS Organises Biological Explanation.

APS Box — The Organisational Grammar of APS

APS does not explain living systems through a single privileged principle or explanatory level. Instead, it organises biological explanation through a coordinated set of concepts that illuminate different aspects of viability-oriented organised persistence.

Viability identifies the conditions under which organised persistence can succeed or fail.
Persistence describes the ongoing regeneration of organised activity across time.
Constraint closure explains the reciprocal organisation through which living systems sustain themselves.
Coupling describes the reciprocal relations through which systems and processes dynamically influence one another.
Scale-coupling explains how organisation is integrated across spatial and temporal scales.
Biological agency describes the active regulation of viability-oriented organisation.
Semiosis explains how viability-relevant differences become biologically meaningful within organised activity.
Resolution identifies the explanatory granularity at which organisation is described or analysed.

These concepts do not function independently. Together they form an organisational grammar through which living systems can be understood as viability-oriented, dynamically organised, and continuously sustained across time.

APS therefore approaches life not as a collection of isolated components, but as organised persistence emerging through the coordinated interaction of agency, process, scale, meaning, and organisation.

Orientation Pathway

Readers new to APS should usually proceed through the following sequence:

For a broader overview of how the major conceptual pathways of APS connect, see APS Architecture Map — Navigating the Framework.

The Problem of Partial Explanation

Many contemporary approaches focus on one organisational dimension of living systems:

genes and inheritance;
information and representation;
control and regulation;
prediction and inference;
self-production and autonomy;
distributed systems dynamics;
emergence and complexity;
cognition and adaptive behaviour.

These frameworks provide powerful explanatory tools.

They clarify how living systems:

regulate activity;
transmit information;
coordinate behaviour;
adapt to changing conditions;
maintain organisation;
reorganise under perturbation;
and evolve through time.

The difficulty arises when a successful explanatory orientation becomes elevated into a complete account of life itself.

A framework capable of explaining one continuity-producing dimension may still leave unexplained the broader organisational conditions under which that dimension becomes biologically meaningful.

Genes matter because living systems persist.
Information matters because differences can affect viability.
Control matters because activity must remain coordinated relative to persistence.
Prediction matters because future-oriented regulation can contribute to continuity.
Autonomy matters because living systems regenerate enabling constraints.
Cognition matters because evaluative semiosis becomes increasingly integrated and temporally extended.

In each case, the explanatory domain already presupposes organised persistence.

APS therefore argues that many contemporary theories remain explanatorily incomplete not because they are false, but because they begin from organisational consequences rather than from the conditions making those consequences possible.

This distinction is central to the comparative architecture of APS.

The framework does not deny the explanatory importance of:

genes;
information;
regulation;
prediction;
control;
autonomy;
or cognition.

Instead, it asks what organisational conditions must already exist for these processes to operate within living systems at all.

The APS Perspective

APS approaches biological explanation through the integrated relations of:

agency;
process;
scale;
viability;
continuity;
perturbation;
and organised persistence.

Living systems are understood as:

viability-oriented;
constraint-closed;
perturbation-sensitive;
and dynamically organised continuities

continuously regenerating and modulating the conditions required for their own persistence across time.

From this perspective, no single mechanism, level, process, or theoretical vocabulary becomes universally primary.

Genes, organisms, developmental systems, ecological relations, regulatory dynamics, predictive processes, and informational structures

may each become explanatorily central depending upon the problem being investigated.

Yet explanatory priority is not ontological priority.

APS Box — Scale Is Not Hierarchy

APS treats scale as a way of analysing and describing organisation rather than as a hierarchy of independently existing ontological levels.

Biological phenomena can be examined at many scales. Explanations may emphasise molecules, cells, tissues, organisms, ecological systems, evolutionary processes, or social organisation depending on the explanatory question being addressed. These scales do not represent separate worlds stacked above one another. They are different perspectives on interconnected processes of organised persistence.

Scale therefore concerns explanatory resolution rather than ontological rank. Different scales reveal different organisational relationships, different continuity architectures, and different aspects of viability-oriented persistence. No single scale is automatically more fundamental than the others simply because it is smaller.

APS consequently rejects the assumption that explanation must always proceed toward progressively smaller components. Understanding biological organisation often requires movement across scales, since continuity is coordinated through interactions linking physiological, developmental, ecological, evolutionary, and social processes.

Key Point: Scale is not a hierarchy of separate levels of reality. It is an explanatory perspective that reveals different aspects of organised persistence across interconnected domains of biological organisation.

APS therefore resists attempts to reduce life to any single organisational dimension.

It does not claim that life is fundamentally:

information processing;
computation;
control;
prediction;
self-production;
adaptation;
or cognition.

Rather, these become intelligible as interconnected dimensions of viability-oriented organised continuity.

APS also treats perturbation as explanatorily central because organisational continuity becomes most visible when its maintenance is challenged through:

destabilisation;
compensation;
adaptation;
repair;
resilience;
and recovery.

APS Box — Perturbation Reveals Organisation

In APS, perturbation is diagnostically important because organisation becomes most visible when it is challenged.

A system observed only under stable conditions may appear organised while relying entirely upon externally supplied support or passive stability. Perturbation reveals whether the system actively contributes to maintaining its own persistence.

Under disruption, systems may:

degrade,
remain externally stabilised,
compensate partially,
or reorganise activity in ways that restore viability.

These responses expose:

organisational dependencies,
capacities for endogenous regulation,
limits of persistence,
and the degree to which viability is actively maintained.

For this reason, APS treats perturbation not as accidental interference, but as a principled diagnostic method.

A living system does not merely undergo change. It modulates its organisation relative to conditions affecting its continued existence.

Perturbation therefore reveals whether:

activity contributes to self-maintenance,
constraint relations are internally sustained,
and organisational coherence can be preserved across changing conditions.

Key Point: In APS, perturbation is diagnostically central because disruption reveals whether a system can reorganise activity in ways that preserve viability-oriented organised persistence.

APS therefore increasingly functions not as a competing specialised theory, but as a continuity-oriented explanatory grammar organising the relations between multiple domains of biological explanation.

The framework attempts to clarify:

why contemporary approaches succeed;
what organisational dimensions they illuminate;
where their explanatory limits begin;
and how their insights may be integrated within a broader account of organised persistence.

APS comparative philosophical architecture

APS and Contemporary Theories. APS integrates mechanistic, organisational, ecological, cognitive, and evolutionary approaches within a continuity-oriented explanatory grammar centred on viability-oriented organised persistence sustained across time.

For the broader philosophical reconstruction of APS as an account of biological intelligibility, see APS as Philosophy — A Viability-Oriented Account of Biological Reality.

APS and Organisational Biology

Among contemporary approaches to theoretical biology, organisational and autonomy-based frameworks are among the closest conceptual neighbours to APS.

Work associated with organisational biology — especially theories of:

autonomy;
constraint closure;
and self-maintaining organisation

has played a major role in challenging reductionist and mechanistic conceptions of life.

These approaches argue that living systems cannot be adequately understood as merely collections of independently functioning parts.

Organisms instead exist through dynamically organised networks of mutually enabling constraints continuously regenerating the conditions of their own persistence.

APS strongly converges with these insights.

The framework likewise treats living systems as:

organisationally constituted;
dynamically maintained;
viability-oriented;
perturbation-sensitive;
and intrinsically normative.

Biological functions are understood in relation to the persistence of organised systems rather than as isolated mechanical effects.

Failure, malfunction, repair, adaptation, and resilience

become intelligible only relative to the continued viability of the organisation itself.

At the same time, APS attempts to extend organisational approaches in several important ways.

First, APS places greater emphasis on temporally extended continuity processes rather than organisational structure alone.

Living systems are not merely organised states but dynamically regulated continuities sustaining persistence through ongoing transformation across time.

APS Box — Organisational Biology and Persistence

Contemporary organisational approaches in biology argue that living systems are not merely collections of independently functioning parts but dynamically self-maintaining organisations constituted through mutually dependent constraints. Organisms continuously regenerate the conditions enabling their own continued existence, producing forms of intrinsic normativity grounded in organisational persistence rather than externally imposed goals (Moreno and Mossio 2015; Mossio 2023).

APS strongly converges with these insights.

The framework likewise treats living systems as viability-oriented, constraint-closed organisations whose components and processes remain biologically meaningful only within the context of organised persistence. Functions, regulation, adaptation, repair, and malfunction are therefore understood relative to the continued viability of the organised system itself.

APS, however, places greater emphasis on temporally extended persistence dynamics, adaptive regulation, and biological agency across changing conditions.

From the APS perspective, living systems are not merely self-maintaining organisational structures. They are ongoing persistence processes actively modulating system–environment relations in ways contributing to continued viability across time.

APS therefore incorporates organisational biology as a foundational insight while situating organisation within a broader explanatory grammar centred on persistence, agency, process, and scale.

Second, APS integrates organised persistence explicitly across:

agency;
process;
scale;
perturbation;
adaptation;
and continuity regulation

rather than treating organisational closure primarily at the level of self-production alone.

Third, APS extends organisational analysis into:

cognition;
semiosis;
meaning;
evaluation;
diagnosis;
resilience;
and explanatory structure itself.

APS therefore converges strongly with organisational biology while attempting to provide a broader explanatory grammar for biological intelligibility.

Integration Rather Than Rejection

APS does not position itself outside contemporary theoretical biology.

On the contrary, the framework draws heavily upon insights from:

systems theory;
autonomy theory;
process philosophy;
enactivism;
evolutionary theory;
mechanistic biology;
ecological theory;
and biosemiotics.

What distinguishes APS is not the rejection of these traditions, but the attempt to reorganise them within a more explicit account of:

viability-oriented continuity;
organised persistence;
perturbation-sensitive regulation;
and dynamically sustained biological organisation.

The following articles explore these relations in greater detail:

These articles examine:

where APS converges with existing frameworks;
where it diverges from them;
and how it attempts to integrate their insights within a broader continuity-oriented explanatory architecture.

APS therefore operates integratively without collapsing into unrestricted theoretical pluralism.

Rather than simply combining concepts from multiple traditions, APS attempts to specify the organisational conditions under which those concepts become biologically meaningful.

The framework therefore aims for:

explanatory integration without reduction;
and pluralism without fragmentation.

Contemporary Convergences

Recent developments in:

life-inspired machine intelligence;
multiscale agency;
systems cognition;
and distributed biological regulation

increasingly converge on themes central to APS.

Work by Pezzulo and Levin (2026), for example, emphasises:

temporally extended agency;
multiscale coordination;
persistence-sensitive organisation;
and distributed regulation

through concepts such as “cognitive light cones.”

Although developed independently and within different research contexts, such approaches increasingly recognise that biological organisation cannot be fully understood through isolated mechanisms or local optimisation alone.

These convergences are philosophically significant.

They suggest that contemporary biology, cognition research, and artificial systems theory may be progressively rediscovering the organisational importance of:

continuity;
persistence;
scale integration;
adaptive regulation;
perturbation-sensitive organisation;
and distributed agency.

APS attempts to provide a broader explanatory architecture capable of situating these developments within a unified account of viability-oriented organised persistence.

APS, Holism, and Organicism

APS rejects reductionist accounts treating biological organisation as nothing more than the behaviour of isolated parts.

But this does not make APS a simple form of holism or a revival of classical organicism.

APS is organisational rather than merely holistic or organismic.

It accepts that living systems must be understood as:

integrated;
self-maintaining;
temporally organised;
and continuity-producing processes,

but it does not treat “the whole” as explanatorily sufficient, nor does it return to classical organismic metaphysics.

For further clarification, see:

The following articles examine influential contemporary frameworks individually.

Each article clarifies both the explanatory strengths of the framework and the organisational limits preventing it from functioning as a complete account of life itself.

Why APS Reframes Biology
Why Life Is Not DNA’s Way of Making More DNA
Why Life Is Not Information Processing
Why Life Is Not Control Theory
Why Life Is Not Active Inference
Why Life Is Not Enactivism
Why Life Is Not Autopoiesis
Why Life Is Not Computation
Why Life Is Not Intelligence

These articles should not be read as dismissals.

Each framework captures important organisational realities.

The APS claim is not that such theories are mistaken, but that none, by itself, fully explains the viability-oriented organised persistence distinguishing living systems as living systems.

How to Read This Comparative Series

These articles may be read independently depending upon the reader’s interests.

For a more structured pathway through the framework:

Begin with What Is Life? for the central APS account of living organisation.
Read APS as Philosophy — A Viability-Oriented Account of Biological Reality for the broader philosophical reconstruction of biological intelligibility.
Explore the clarification articles to understand how APS differs from influential contemporary approaches.
Read the integration articles to see how APS relates to systems theory, autonomy theory, and contemporary evolutionary frameworks.

Taken together, these articles show how APS attempts to transform a fragmented theoretical landscape into a more integrated account of biological organisation.

The goal is not:

theoretical unification through reduction;
nor unrestricted pluralism without explanatory constraint.

It is:

explanatory integration through viability-oriented organised persistence sustained across time.

Conclusion

APS situates contemporary biological theories within a broader explanatory architecture centred on organised continuity and persistence.

Mechanistic, informational, predictive, ecological, cognitive, autonomy-based, and systems-oriented approaches

each illuminate important dimensions of living systems.

APS does not reject these frameworks.

It instead asks:

what organisational conditions make their explanatory successes possible;
how their insights relate;
and how they may be integrated within a continuity-oriented account of biological intelligibility.

Living systems therefore become intelligible not through any single explanatory vocabulary alone, but through the dynamically organised continuity by which viability is sustained across:

perturbation;
adaptation;
transformation;
scale;
ecology;
development;
cognition;
and evolution.

APS consequently functions not merely as another specialised theory of life, but as an explanatory grammar organising the relations between contemporary biological theories themselves.

Key Terms

continuity · persistence · viability · perturbation · organisation · adaptation · cognition · evolution · autonomy · systems theory

APS and Contemporary Theories

APS and Contemporary Theories

Understanding Biological Explanation Across Frameworks

Orientation Pathway

The Problem of Partial Explanation

The APS Perspective

APS and Organisational Biology

Integration Rather Than Rejection

Contemporary Convergences

APS, Holism, and Organicism

How to Read This Comparative Series

Conclusion

Key Terms

See Also

Related Articles

References

Related Articles

APS as Philosophy — A Viability-Oriented Reconstruction of Biological Intelligibility

The Explanatory Geometry of Biology — How APS Organises Biological Explanation

Description, Explanation, and Definition in Biology — An APS Clarification

Reductionism in Biology — An APS Clarification

Emergence in Biology — An APS Clarification

What Is Life? — A Biological Question Revisited

APS and Systems Theory — Similarities, Differences, and Limits

APS and Autonomy Theory — From Constraint Closure to Viability-Oriented Organisation

APS and the Extended Evolutionary Synthesis — Conditions and Extensions of evolution

Why Life Is Not Computation — An APS Clarification

Why Life Is Not Intelligence — An APS Clarification

Temporal Organisation and Organised Persistence

Diagnosis as Continuity Analysis