Understanding APS — The Structure of the Framework

What This Article Explains

This article develops the internal structure of the APS framework. While What Is APS? introduces its core ideas, this page shows how those ideas fit together—how agency, process, and scale operate as a unified explanatory grammar.

For a broader account of how scientific explanation is structured, see Explanatory Grammar.

APS understands life as viability-oriented, constraint-closed organisation. Living systems are not passive objects governed by external forces, but systems that actively sustain the conditions of their own persistence.

Because this organisation must be continuously maintained, biological processes are not neutral events but are organised in relation to viability.

This perspective allows different areas of biology—physiology, development, evolution, and cognition—to be understood within a single explanatory structure.

The Three Dimensions of APS

APS is organised around three inseparable dimensions:

Biological agency — the activity through which living systems maintain and regulate their own viability
Process — the dynamic organisation through which this activity unfolds
Scale — the spatial and temporal extent across which these processes operate

These are not separate “levels,” components, or distinct sources of causation. They are co-constitutive aspects of the same organisation. Living systems exist only through their continuous coordination across these dimensions over time.

APS Box — Hierarchy vs Scale

Biological systems are often described using hierarchical language: lower and higher levels, more basic and more advanced forms, or processes that build upward from simple to complex.

APS treats this as a modelling convenience, not a feature of reality.

In place of hierarchy, APS uses the concept of scale. Biological organisation unfolds across continuous, interacting spatial and temporal scales, with no intrinsic ranking of “higher” or “lower.” What appear as levels are regions of relative stability within a dynamically coupled system.

This shift matters because hierarchical language can imply that some processes are more fundamental than others, or that explanation proceeds in a single direction. APS instead emphasises reciprocal, scale-coupled organisation, where causation and regulation operate across interacting domains.

Key Point. Biological organisation varies in form across scales, not in rank within a hierarchy.

Why APS Is Different

Traditional approaches in biology often prioritise one explanatory dimension:

mechanism (structure and parts)
information (genes and codes)
selection (evolutionary filtering)

APS does not reject these approaches, but shows that they presuppose something more fundamental: organised persistence.

From an APS perspective:

mechanisms function only within systems that maintain themselves
information matters only within systems for which differences make a difference
selection operates only on systems capable of sustaining viable organisation

APS therefore reframes biology around the conditions that make these explanations possible.

APS Box — What APS Does Not Assume

APS introduces a specific explanatory grammar for biology. It does not rely on a number of common assumptions that are often taken for granted in other frameworks.

No reduction to parts as primary explanans
APS does not assume that biological explanation is fundamentally about decomposing systems into constituent parts.
No primacy of genetic or informational code
Genes and information are treated as components within organised systems, not as the defining basis of life.
No hierarchy of fixed levels of organisation
APS does not assume discrete levels (e.g. gene → cell → organism) as ontological layers; it works with continuous, interacting scales.
No requirement for representation or internal models
Basic biological regulation does not depend on representational content; viability-oriented modulation precedes representation.
No external assignment of function or purpose
Function and purpose are not imposed by observers but arise from the organisation of viability-oriented activity.
No separation between organism and environment as independent systems
Organism and environment are understood as dynamically coupled aspects of a single viability-oriented process.
No assumption that normativity is mental or subjective
Biological normativity is enacted through organisation and does not depend on consciousness or experience.

APS does not reject these concepts outright, but reinterprets them within a framework grounded in viability-oriented, constraint-closed organisation.

Key Point. APS reframes common biological assumptions within a viability-oriented, constraint-closed framework rather than accepting them as explanatory primitives.

How to Use This Framework

APS is a framework for organising understanding, not just a theory to be learned.

You can use it to:

interpret biological phenomena across domains
clarify how different explanations relate to one another
distinguish what is fundamental from what is derived

The framework becomes clearer as you move between definitions, articles, and examples. The core terms are defined precisely in the Glossary, which provides the conceptual foundation for the site.

Where to Go Next

To deepen your understanding of APS:

Read What Is APS? for a concise overview
Explore the Glossary for precise definitions
See The Core Structure of APS — How the Framework Fits Together for a more formal account

You can also continue into key areas of the framework:

Foundations of biological organisation
Evolution and transformation
Cognition and meaning

For the clearest entry into how APS explains biological systems, follow:

→ How APS Explains Life — A Two-Step Guide