---
title: "System structure"
source: "https://systems-analysis.info/eng/System_structure"
wiki: "systems-analysis.info/eng"
article: "System_structure"
language: "en"
categories:
  - "Category:English"
  - "Category:Science"
  - "Category:System"
  - "Category:Systems analysis"
  - "Category:Systems approach"
  - "Category:Systems theory"
  - "Category:Terminology"
revision_id: 371
wiki_created_at: 2026-09-06T22:22:42Z
wiki_modified_at: 2026-09-06T22:22:42Z
downloaded_at: 2026-09-07T22:23:01Z
---

# System structure

**System structure** is a fundamental concept in systems analysis, reflecting the way a system's elements are organized and the nature of the connections between them. Structure defines the internal arrangement of a system, ensuring its integrity, stability, and ability to function as a single entity.

## General Definition

Structure is the **set of essential connections** between the elements of a system, which determines their ordered interaction. It provides integrity and gives the system specific properties that distinguish it from a simple sum of its constituent components.

## Role of Structure in Systems Analysis

In systems analysis, structure performs the following functions:

- Organizes the internal space of the system;
- Defines the constraints on the behavior of elements;
- Affects the functionality and stability of the system;
- Is the source of [emergent properties](https://systems-analysis.info/eng/Emergence "Emergence")—qualities that are not reducible to the properties of individual parts.

## Structuredness as a Property

**Structuredness** is one of the four basic static properties of systems. It means that the system's elements are not autonomous but are connected in a specific way, forming a unified whole. The connections within a structure can be:

- Physical (e.g., wires, pipes);
- Logical (e.g., data dependencies);
- Functional (e.g., cause-and-effect interactions);
- Formal and informal (in organizations).

## Structural Model

A **model of a system's structure** is an abstract representation of the set of essential connections between components. There can be many structural models, and the choice of a specific model depends on the goal of the analysis. The definition of a connection's "essentialness" is always evaluative and depends on the research objectives.

Typical structural models include:

- Graph-based (directed and undirected connections);
- Matrix-based (structural adjacency and incidence matrices);
- Hierarchical (trees and multi-level representations);
- Modular (block decomposition).

## Types of Structures

Systems can have various types of structures:

- **Formal** — defined in regulations and documentation;
- **Informal** — emerges from actual interactions;
- **Functional** — defines the distribution of functions among elements;
- **Physical** — indicates the physical placement of components;
- **Logical** — an abstract diagram of interconnections;
- **Fractal** — a structure that repeats at different levels (the principle of self-similarity).

## Relationship between Structure and Emergence

A key principle of systems analysis states that **a system's structure is the source of its emergent properties**. This means that the same elements, connected in different ways, form systems with different properties. This explains why it is impossible to understand a system by studying its elements in isolation.

## Challenges in Modeling Structure

Building a structural model involves a number of challenges:

- The need to first define the system's composition;
- Uncertainty in determining the significance of connections;
- The simultaneous presence of multiple overlapping structures (e.g., hardware/software, formal/informal);
- The subjectivity of judgments when selecting a model.

## Structure and Development

Structure can change over time as a system operates or develops. A distinction is made between:

- **Operation** — changes that occur without altering the structure;
- **Development** — a change in the structure itself, which generates new properties and capabilities.

## External links

- <a href="https://en.wikipedia.org/wiki/Systems_architecture" class="external text" rel="nofollow">Systems architecture — Wikipedia</a>

## See also

- [System](https://systems-analysis.info/eng/System "System")
- [Emergence](https://systems-analysis.info/eng/Emergence "Emergence")
- [Hierarchy](https://systems-analysis.info/eng/Hierarchy "Hierarchy")
- [Model](https://systems-analysis.info/eng/Model "Model")
- [Systems analysis methodology](https://systems-analysis.info/eng/Systems_analysis_methodology "Systems analysis methodology")