Interaction Overview Diagram is a behavioral diagram within the Unified Modeling Language (UML) that serves to illustrate the control flow among various interactions or interaction fragments within a system. Its primary function is to offer a bird’s-eye view of how interactions interact and control flows within individual interactions or sequence diagrams are organized. Interaction Overview Diagrams prove invaluable when tackling intricate systems housing multiple interactions, assisting in their coordination and organization.

Purpose and Role:

The fundamental purpose of an Interaction Overview Diagram is to depict the control flow between diverse interactions and interaction fragments within a system. It accomplishes this by:

  1. Presenting an overview of control flow in complex systems featuring numerous interactions.
  2. Modeling the coordination among different interactions or sequence diagrams.
  3. Visualizing the sequence of interactions or interaction fragments.


An Interaction Overview Diagram comprises several key components:

Element Description
Interaction Fragments Building blocks representing various interactions or interaction operands within alternatives, loops, optional, or references to other IODs.
Lifelines Vertical lines representing entities involved in the interactions, which can be objects, components, or actors.
Messages Arrows indicating communication between lifelines, illustrating the flow of control between interactions and interaction fragments.
Operators Symbols used to denote specific interaction behaviors, such as loops, alternatives, and parallel execution.
Initial Node Represents the starting point of the interaction overview diagram, indicating where the control flow begins.
Final Node Represents the ending point of the interaction overview diagram, signifying where the control flow terminates.

An Interaction Overview Diagram Example


What is Interaction Overview Diagram?

Importance and Benefits:

Interaction Overview Diagrams hold significance in several ways:

  1. Understanding Complex Systems: Interaction Overview Diagrams provide a high-level perspective of interactions within complex systems, simplifying comprehension of how individual interactions interrelate.
  2. Analyzing Control Flow: They facilitate the visualization of control flow between interactions and interaction fragments, enabling in-depth analysis of system behavior.
  3. Simplifying Large Systems: Interaction Overview Diagrams break down intricate systems into more manageable components, simplifying design, development, and maintenance.
  4. Promoting Reusability: They support modular design by enabling the reuse of interaction fragments across multiple diagrams.


Interaction Overview Diagrams are a valuable tool for visually comprehending and representing the control flow between interactions or interaction fragments within a system. They offer a high-level insight into a system’s behavior, aiding in the coordination and organization of individual interactions or sequence diagrams. This proves especially useful in modeling complex systems with multiple interactions, enhancing analysis, and facilitating modular design.

Leave a Comment

Your email address will not be published.