Biology explains many things.
But what is biology itself trying to explain?

Biology has achieved extraordinary success in explaining living systems, yet some of its deepest conceptual questions remain unresolved. What is life? What distinguishes biological organisation from every other organised system? How do concepts such as evolution, function, agency, development, and ecology relate?

APS investigates these questions. Rather than replacing established biological theories, it asks whether and how biology’s central concepts can be related through a common concern with the organisation and persistence of living systems.

Contemporary biology succeeds through explanatory plurality. Mechanistic, evolutionary, developmental, ecological, informational, physiological, mathematical, and organisational approaches ask different questions and achieve different kinds of understanding.

APS does not seek to replace this plurality with a single theory. It develops a substantive and integrative account of living organisation whose claims can be compared with other biological and philosophical approaches. The independent comparative methodology used to conduct such assessments is developed in Comparative Explanatory Methodology in Theoretical Biology .

APS Research is the scholarly programme through which APS claims, methods, and applications are compared with existing work, assessed against evidence and alternatives, and examined for limitations and failure conditions.

It complements the wider Articles collection while connecting completed website research with the peer-reviewed publications, preprints, and deposited papers recorded in Publications.

To understand APS, begin with two gateway questions: what biology is trying to explain, and what distinguishes a biological system from every other organised system. Then follow the Orientation pathway through the structure and conceptual architecture of APS.

Supporting orientation: Understanding APS — The Structure of the Framework provides a wider guide to the pathways, domains, and research programmes of APS.

Biology has transformed our understanding of living systems while leaving foundational questions open. What is life? What distinguishes biological systems? What is agency? What is evolution transforming? What makes function meaningful? What is biological explanation explaining?

APS approaches these questions as opportunities for conceptual clarification rather than as evidence of scientific failure. They arise because biology’s continuing explanatory success makes foundational questions increasingly explicit.

Organised Persistence

Living systems continually establish, maintain, repair, reorganise, and transform the conditions that make biological activity possible.

APS describes this continuing achievement as organised persistence. Organisation here is ongoing activity rather than a static arrangement, and persistence is continuity maintained through change rather than changeless endurance.

Mechanistic, developmental, ecological, physiological, evolutionary, and organisational explanations address different aspects of biological continuity and change. APS proposes organised persistence as a candidate comparative explanatory target for investigating how their distinctive achievements relate.

Why APS Reframes Biology

APS asks a simple but foundational question: what is biology trying to explain? The examples below illustrate how APS relates familiar biological questions through its concern with viability-oriented organisation and organised persistence.

These examples do not redefine biology. They show how APS proposes to relate biological explanations by asking how each bears on the organisation and persistence of living systems.

Different domains continue asking different questions. APS investigates how their explanatory achievements illuminate different aspects of living organisation.

APS develops its substantive and integrative account across a growing range of biological and philosophical questions. Each domain examines a different aspect of living organisation while remaining connected through APS's concern with viability and organised persistence.

Together these domains map the breadth of APS inquiry rather than representing separate theories or independent branches. Their inclusion identifies areas of APS investigation; it does not by itself indicate that APS-specific explanatory gain has been demonstrated within them.

APS depends upon more than a collection of ideas. Its explanatory architecture is built upon stable concepts, carefully defined terminology, and explicit relationships that allow the framework to develop cumulatively while remaining open to critical assessment.

Rather than treating concepts as isolated definitions, APS organises them into an explanatory architecture. Its concepts must remain coherent, but coherence alone is not evidence. The relationships expressed by APS pathways must be specified and then assessed using independently applicable comparative controls, material evidence, and the strongest relevant alternatives. They must be qualified or rejected when they fail.

APS is developed as a substantive and integrative framework for theoretical biology rather than as a philosophical system. Nevertheless, questions about biological organisation, explanation, function, purpose, normativity, and scientific understanding are inseparable from philosophy of biology.

These articles begin with the importance of philosophy of biology itself and then examine the philosophical status, ontological commitments, and explanatory architecture of APS.

APS is often compared with reductionism, holism, systems biology, autopoiesis, computational approaches, artificial intelligence, and other influential perspectives in biology and philosophy. These comparisons are valuable because they help locate APS within contemporary scientific discussion. At the same time, superficial similarities can obscure important differences. APS does not reject existing biological theories or explanatory traditions. Instead, it asks how their distinctive explanatory achievements may relate to the organisation and persistence of living systems.

The articles below examine where APS converges with other approaches, where it differs, and whether those distinctions matter for biological explanation.