---
title: "System model"
source: "https://systems-analysis.info/eng/System_model"
wiki: "systems-analysis.info/eng"
article: "System_model"
language: "en"
categories:
  - "Category:Basic concepts"
  - "Category:English"
  - "Category:Mathematical modeling"
  - "Category:Modeling"
  - "Category:Science"
  - "Category:System"
  - "Category:Systems analysis"
  - "Category:Systems analysis terminology"
  - "Category:Systems approach"
  - "Category:Terminology"
revision_id: 367
wiki_created_at: 2026-09-06T22:22:40Z
wiki_modified_at: 2026-09-06T22:22:40Z
downloaded_at: 2026-09-07T22:22:59Z
---

# System model

**System Model** is a simplified representation of a system that reflects its most essential elements, connections, and processes, which are important for analyzing, designing, managing, or understanding the system's behavior in a specific context. A model is created for the purpose of studying the system without the need to interact with it in reality.

## General Definition

Modeling is one of the central tools of systems analysis. A model allows one to:

- reflect the structure, functions, and behavior of the system;
- study the system under various conditions;
- predict the system's responses to influences;
- develop and test solutions before their implementation.

A model is created as a representation of an object, a research objective, and a means of analysis. It serves as an intermediary between the real system and the person studying or managing it.

## Properties of a Model

- **Adequacy** — reflection of the essential features of the original.
- **Fitness for purpose** — built with the modeling objective in mind.
- **Simplicity** — non-essential details for the task are omitted.
- **Operationality** — suitable for analysis, calculations, and experiments.
- **Interpretability** — comprehensibility of the results to the model's user.

## Types of System Models

Models can be classified on various bases:

### By Degree of Formalization

- **Verbal (descriptive)** — based on natural language.
- **Graphical** — diagrams, charts, blocks, graphs.
- **Formal** — mathematical, logical, algorithmic.
- **Simulation** — reproduce behavioral dynamics in an artificial environment.

### By Type of Representation

- **Structural** — capture elements and their connections.
- **Functional** — represent functions and transformations.
- **Dynamic** — model behavior over time.
- **Information** — describe data flows and signals.
- **Goal-oriented** — focus on the hierarchy of goals and achievement criteria.

### By Degree of Abstraction

- **Conceptual** — general representations and principles.
- **Analytical** — contain formalized dependencies.
- **Computational** — implemented as program code or a computer model.

## The Model as a Reflection of the System

A system model represents:

- [structure](https://systems-analysis.info/eng/System_structure "System structure") — which elements the system consists of;
- [connections](https://systems-analysis.info/eng/Connections_in_systems "Connections in systems") — how these elements interact;
- [processes](https://systems-analysis.info/eng/Process "Process") — what actions take place within the system;
- [goals](https://systems-analysis.info/eng/Goal "Goal") — what results the system strives for;
- context — how the system interacts with its environment.

## Objectives of Modeling

Models are developed for various purposes:

- analysis of the current state;
- design of a new system;
- selection of an optimal solution;
- prediction of behavior;
- management of operation and development;
- training and knowledge transfer.

## Model Construction Stages

1.  Problem formulation for modeling — defining goals and constraints.
2.  Model type selection — depending on the objective and available data.
3.  Parameter identification — defining essential characteristics.
4.  Model structure construction — describing elements and their connections.
5.  Formalization — describing behavior using mathematical or algorithmic means.
6.  Analysis and verification — checking the model for correctness.
7.  Interpretation of results — using the model for decision-making.

## The Model and Systems Thinking

The use of models promotes:

- a holistic perception of the object;
- identification of key factors;
- extraction of structure and cause-and-effect relationships;
- the transition from empirical understanding to formalized analysis.

## The Model in the System Lifecycle

Different models are used at different stages of the lifecycle:

- in the design phase — conceptual and technical models;
- in the operational phase — operational models for management;
- in the development phase — predictive and scenario-based models.

## Examples of Models

- Flow diagrams and architectural schematics;
- Mathematical control models (e.g., state-space equations);
- Simulation models;

## Relationship to Other Concepts

- [System](https://systems-analysis.info/eng/System "System") — the object of modeling;
- [Function](https://systems-analysis.info/eng/Function "Function") — the implementation of an action in the model;
- [Process](https://systems-analysis.info/eng/Process "Process") — the dynamic part of the model;
- [Goal](https://systems-analysis.info/eng/Goal "Goal") — determines the model's direction;
- System boundaries — define the scope of the model;
- [System environment](https://systems-analysis.info/eng/System_environment "System environment") — the external context for modeling.

## External links

- <a href="https://en.wikipedia.org/wiki/Systems_modeling" class="external text" rel="nofollow">Systems modeling — Wikipedia</a>
- <a href="https://plato.stanford.edu/entries/models-science/" class="external text" rel="nofollow">Models in Science — Stanford Encyclopedia of Philosophy</a>

## See also

- [Modeling](https://systems-analysis.info/eng/Modeling_(scientific) "Modeling (scientific)")
- [System](https://systems-analysis.info/eng/System "System")
- [Function](https://systems-analysis.info/eng/Function "Function")
- [System structure](https://systems-analysis.info/eng/System_structure "System structure")
- [System dynamics](https://systems-analysis.info/eng/System_dynamics "System dynamics")
- [Black box model](https://systems-analysis.info/eng/Black_box "Black box")