Analysis, Synthesis, and the Direction of Explanation

Abstract

Scientific explanation is commonly treated as proceeding by analysis—breaking systems into constituent parts. This article argues that this emphasis reflects a historically contingent bias rather than a necessity of explanation. It distinguishes two complementary directions of explanation—analysis and synthesis—and shows how the privileging of analysis has shaped reductionist interpretations of biology. Within APS, explanation is reoriented toward organisation, constraint, and viability, rejecting any intrinsic priority of parts over wholes.

The unnoticed assumption in scientific explanation

Scientific explanation is often assumed to proceed by breaking systems into their constituent parts. Complex phenomena are explained by identifying underlying components and the interactions between them. This approach—analysis—is widely regarded as the most rigorous and reliable form of explanation.

Because of its success, this mode of explanation is rarely questioned. It is treated not as one possible approach among others, but as the default structure of explanation itself.

This assumption has far-reaching consequences. It encourages the view that explanatory depth lies in smaller components, and that what is most fundamental is what is most basic in composition. In biology, this has contributed to the widespread perception that genes, molecules, or biochemical processes provide the most complete explanations of living systems.

However, this reflects a particular orientation of explanation rather than a necessary feature of reality.

This article does not argue against reductionism as such, but examines a prior question: how explanation is oriented. The status of reductionism within APS is addressed separately.

Two directions of explanation

Explanation can proceed in at least two distinct but complementary directions.

Analysis explains a system in terms of its constituent parts and their interactions.
Synthesis explains a component in terms of the wider system within which it operates.

These are not competing methods but reciprocal perspectives.

To explain a cell analytically is to describe its molecular composition and internal processes.
To explain a cell synthetically is to situate it within the organism whose organisation it contributes to.

Both are legitimate. Neither is intrinsically more fundamental than the other.

APS Box — Analysis vs Synthesis — Two Directions of Explanation

Scientific explanation can proceed in two complementary directions:

Analysis explains a system in terms of its parts and their interactions.
Synthesis explains a component in terms of the wider system within which it operates.

In practice, science has strongly favoured analysis, treating explanations that move toward smaller components as more fundamental. This has encouraged reductionist interpretations in which genes, molecules, or particles are taken to provide the deepest explanations.

APS rejects this asymmetry. Components and systems are mutually defining:

parts only have significance within an organised system
systems only exist through the coordinated activity of their parts

Biological explanation therefore requires both directions. It is not a matter of choosing between parts and wholes, but of understanding how organised activity is maintained across them.

The asymmetry in practice

Although analysis and synthesis are conceptually symmetrical, they are not treated symmetrically in scientific practice.

Over several centuries, scientific inquiry has strongly favoured analysis. Problems are approached by decomposition, and explanatory success is often measured by the ability to reduce phenomena to simpler components.

This has produced an implicit hierarchy of explanation:

smaller components are treated as more fundamental
larger organisations are treated as derivative

This hierarchy is reinforced by the language commonly used to describe explanation. Explanations are said to move “downward” to underlying parts or “upward” to higher-level organisation. Although such terms are often used metaphorically, they are not neutral. They encourage a hierarchical interpretation in which lower levels are implicitly treated as more basic and higher levels as dependent or secondary.

The notion of a “direction” of explanation can therefore be misleading. It suggests that explanation proceeds along a single axis, typically from wholes to parts, rather than between interdependent aspects of a system. In doing so, it obscures the reciprocal relation between analysis and synthesis.

APS Box — Hierarchy vs Scale

Biological systems are often described using hierarchical language:

lower and higher levels
simple and complex forms
or upward-building layers of organisation

APS treats such descriptions primarily as explanatory conveniences rather than as literal features of biological reality.

In place of hierarchy, APS uses the concept of scale.

Living systems are organised across continuously interacting spatial and temporal scales, linked through processes of scale-coupling and reciprocal organisational dependence. Molecular, physiological, behavioural, ecological, and evolutionary processes are not separate ontological layers but dynamically integrated aspects of continuous biological organisation.

APS therefore rejects the idea that biological explanation must proceed:

from lower to higher levels
from more fundamental to less fundamental domains
or through unidirectional chains of causation

Instead, biological organisation is understood through reciprocal relations distributed across interacting scales.

APS also distinguishes scale from resolution.

Scale refers to the spatiotemporal organisation of biological activity itself. Resolution refers to the granularity at which that organisation is described or analysed. What appear as “levels” often reflect differences in explanatory resolution rather than discrete layers of reality.

This shift matters because hierarchical language can unintentionally imply:

privileged explanatory domains
ontological stratification
or one-way causal determination

APS instead understands living systems as dynamically organised, scale-coupled processes sustained through reciprocal organisational relations.

Key Point. Biological organisation varies across interacting scales, not through ranked ontological levels or hierarchical layers of reality.

This asymmetry is methodological rather than ontological. It reflects how explanation is typically conducted, not how reality is structured.

Consequences for biological explanation

In biology, the privileging of analysis has had a profound influence.

Living systems are frequently explained in terms of genes, molecular pathways, and biochemical mechanisms. These are indispensable components of biological explanation. However, when explanation is oriented primarily in this way, these components can obscure the organisational conditions that make biological systems what they are.

A living organism is not merely a collection of molecules. It is a dynamically maintained organisation in which components are continuously produced, regulated, and coordinated. The same molecular constituents can be present in both living and non-living systems, but only in the former are they organised in a way that sustains ongoing activity.

When explanation proceeds primarily by decomposition, this organisational dimension is not eliminated but displaced. The system is analysed into parts, but the conditions under which those parts collectively sustain a living process are no longer treated as primary objects of explanation.

The result is not an incorrect account, but an incomplete one.

Reorienting explanation in APS

APS does not reject analysis. The identification and investigation of components is essential to scientific practice. However, it rejects the assumption that analysis provides a more fundamental form of explanation.

Instead, APS treats explanation as inherently relational and organisation-dependent.

This reorientation reflects a deeper shift in explanatory structure, developed in The Explanatory Geometry of Biology — How APS Organises Biological Explanation, where these relations are made explicit as a coherent explanatory grammar.

Components are understood in terms of the roles they play within a system.
Systems are understood in terms of the constraints and processes that maintain their organisation.
Explanation is oriented toward the conditions under which a system persists as a coherent entity.

This reorientation shifts explanatory emphasis from composition to organisation.

In this framework, biological explanation is not exhausted by identifying parts and their interactions. It also requires understanding how those interactions are structured so as to maintain the system’s viability over time.

No privileged direction of explanation

Within APS, there is no intrinsic priority between analysis and synthesis.

Both directions are necessary:

analysis reveals the components and mechanisms involved
synthesis reveals the organisational context that gives those components their functional significance

Explanatory adequacy depends on the coordination of these perspectives, not the reduction of one to the other.

The dominance of analysis in modern science is therefore best understood as a historically entrenched habit of explanation rather than a discovery about the fundamental structure of the world.

Recognising this opens the possibility of a more balanced explanatory framework—one in which organisation, constraint, and viability are treated as central, rather than derivative, features of biological systems.

Key point

Scientific explanation has historically privileged analysis, treating explanation in terms of parts as more fundamental. APS rejects this asymmetry, recognising both analysis and synthesis as necessary and treating organisation, rather than composition alone, as central to biological explanation.