Agency · Process · Scale
A structured framework for understanding life as viability-oriented, constraint-closed organisation.
APS brings together concepts from across biology into a unified explanatory system, showing how living systems sustain, regulate, and transform themselves across space and time. Rather than focusing on isolated components or fixed levels, it clarifies the organisation through which life persists and evolves.
If you are new to APS, begin with APS — A Viability-Oriented Framework for Understanding Life .
For the clearest entry into the conceptual core of the framework, follow How APS Explains Life — A Two-Step Guide .
Explore the framework through: Glossary (core definitions), Articles (organised by conceptual clusters)
Start Here
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A canonical introduction to APS as a framework for understanding life as viability-oriented, constraint-closed organisation.
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A first step into APS: what biological explanation must explain if living systems are to be understood as living.
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A systematic account of how APS organises explanation through agency, process, scale, temporal dynamics, and coupling.
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Physiology and Evolution in APS
ArticleA clear application of APS showing how present-time regulation and historical transformation belong to one explanatory system.
Understanding Life — Beyond Common Explanations
Many modern theories explain important aspects of life—genes, information, control, inference, and self-organisation.
But none of these alone explains what makes a system alive.
The APS framework clarifies this by showing that life is not defined by any single mechanism or process, but by the organisation that sustains itself through ongoing activity.
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Why genes matter profoundly in biology without defining what life is.
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Why Life Is Not a Machine
ArticleWhy mechanistic description captures important processes without exhausting living organisation.
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Why information becomes meaningful only within viability-oriented organisation.
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Why Life Is Not Active Inference
ArticleWhy prediction and inference describe modes of activity within life rather than life itself.
These articles form part of a broader comparative series situating APS in relation to major contemporary frameworks in biology and cognition.
Explore All ComparisonsAPS Glossary — Why Definitions Matter
The glossary is the conceptual spine of the APS framework. Each entry provides a precise, governed definition grounded in the framework’s commitments to agency, process, and scale.
Browse the GlossaryRecent Canonical Publications
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In the Agency–Process–Scale (APS) framework, adaptation is the present-tense reorganisation of viability-oriented, constraint-closed organisation through which living systems sustain themselves under changing conditions. This article clarifies adaptation as an expression of biological agency and as the process linking immediate regulation with long-term evolutionary transformation.
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This article clarifies what makes explanation distinctively biological by arguing that biological inquiry must account not only for how systems behave, but for the viability-oriented biological organisation that makes living systems the kind of systems they are.
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Environment, Coupling, and Agency — Why Organisms and Surroundings Co-Produce Each Other
Canonical ArticleThis article explains how the APS framework reconceives the relationship between organisms and their environments. Rather than treating the environment as an external backdrop, APS understands it as a relational domain co-constituted through ongoing coupling with viability-oriented biological organisation.