UML0 4-Static and Dynamic Models In Software Engineering - GeeksforGeeks

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Static and Dynamic Models In Software Engineering
Last Updated : 23 Jul, 2025
Software engineering is the discipline that primarily deals in the application of computer science and
engineering knowledge for designing, building, and sustaining software products. Models can be
classified into two broad categories: static and dynamic. This article analyzes the definitions,
characteristics, and differences between the static and dynamic models in software engineering.
Table of Content
What is Static Model?
What is a Dynamic Model?
Static vs Dynamic Modelling
Conclusion
Frequently Asked Questions
What is a Static Model?
In software engineering, a static model is concerned with the architectural characteristics of a system.
It describes the system's elements and how they are connected at a given time. Static models do not
model the behavior of the system but rather its state. Some of the well-known static models are:
Class Diagrams: Class Diagrams are the residual classes, interfaces, and relationships between
them in an Object-Oriented System. They incorporate attributes, methods, and the relationships of
one class with another.
Entity-Relationship Diagrams (ERD): Mainly employed in database-related work, entity
relationship diagrams depict the entities in a database, their characteristics and the connections
they share.
Component Diagrams: Component Diagram diagrams depict how the entire software is organized
and the relationship that these components of the software have with one another.
Deployment Diagrams: A Deployment Diagram illustrates how software architecture, designed on
a conceptual level, translates into the physical system architecture where the software will run as
nodes.
What is a Dynamic Model?
Dynamic model describes the behavior of complex systems in addition to time and comprises a group
of models that give the current state of the system. It describes how the system evolves with regards
to certain events, the control flow and how the various components of the system interact. They are
particularly crucial in that they describe the real-time character, execution of activities, roles, and
occurrences within the system.
Sequence Diagrams: Sequence diagrams represent the flow of messages between the objects to
achieve a particular task or a process.
State Machine Diagrams: Applied to specify the possible conditions that an object can be in and
the change of these conditions based on events.
Activity Diagrams: Activity diagrams illustrate the actions or processes in a system as well as
show when and if each activity/operation occurs.
Software Engineering Tutorial Software Development Life Cycle Waterfall Model Software Requirements Software Measurement and Metrics
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Use Case Diagrams: Use Case Diagram are principally used to document requirements but also
give a dynamic view since they depict the utilization of the system by the users.
Static vs Dynamic Modelling
Aspect Static Model Dynamic Model
Focus Structure and relationships Behavior and interactions
Time
Perspective
Snapshot at a specific point in time Changes and evolution over time
Examples Class diagrams, ER diagrams,
component diagrams
Sequence diagrams, state machine diagrams,
activity diagrams
Usage Architecture, design, documentation Behavior analysis, workflow modeling
Nature Descriptive Behavioral
Primary
Concern
Static relationships and dependencies Dynamic processes and state changes
Level of Detail High-level structural details Detailed behavioral interactions
Purpose Define system architecture and data
structures
Analyze and validate system behavior
Suitability Suitable for design and specification
phases
Suitable for simulation, testing, and validation
phases
Tools UML class diagrams, ERD tools,
architecture frameworks
UML sequence diagrams, state machine tools,
activity diagram tools
Conclusion
Static models are said to be equally as important as dynamic models in software engineering. Static
models give step by step details of the system design and this helps a lot in designing and
documentation phase. On the other hand, dynamic models provide understanding of how the system
works and when it has to perform how to ensure that it works as intended. Through integrating the
two, the software engineers can develop good systems that are well documented and more reliable.
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