1. Interaction Diagramm
  2. Interaction Diagram Definition

What Is An Interaction Overview Diagram in UML?

Interaction diagrams bring together many existing models and modelling elements: from the use case model, the use cases, the actors, use case scenarios and descriptions; from the class diagram, the objects involved in each scenario and the operations on classes. What is an Interaction Diagram? In short, an Interaction Diagram is a much faster way of analyzing a concrete column for large eccentricities (aka large moments). An example of a Interaction Diagram has been included in Figure 1 (click the hyperlink to expand the image). Figure 1: A Concrete Interaction Diagram (Click here for larger version). Component diagrams show the interaction of component relationships. A component is an executable and exchangeable software unit with defined interfaces and individual identities. A component is, like a class, instanceable and capsules complex functionality.

An interaction overview diagram is a variation of an activity diagram. The difference lies in the fact that interaction overview diagrams’ nodes represent the occurrences of interactions in a system or piece of software. While Using a similar notation to activity diagrams (initial, final, merge, fork, decision), along with interaction occurrences and interaction elements, interaction overview diagrams can show the flow of activity between diagrams.


Why Use An Interaction Overview Diagram?


So when should interaction overview diagrams be used, and what makes them so useful?

Interaction Diagram
  • Useful for visualizing a sequence of activities
  • Helpful for breaking down multiple scenarios and activities into smaller interaction diagrams
  • Eliminates the need for programming complex “if-then-else” decisions and paths for a piece of software

Interaction Overview Diagram Symbols

While interaction overview diagrams share many of its symbols and notation with activity diagrams, it introduces interaction elements and interaction occurrences as two new elements unique. Below is an overview of some of the commonly used notation of interaction overview diagrams.

EdrawMax tips: Don’t confuse an activity diagram with an interaction overview diagram. Interaction overview diagrams show the dependencies and flow between various interaction diagrams, thus providing users with a higher-level overview of a system.

Interaction occurrence

Sometimes referred to as “interaction use”. Used to refer to the contents of existing interaction diagrams. Can be identified as a box with “ref’ in the corner.

Interaction element

Sometimes referred to simply as an “interaction”. Used to display any kind of interaction diagram.


The beginning of a work-flow.


Used to include notes for other users that can’t be communicated within the diagram itself.


A round box used to illustrate the occurrence of an action or event.

Decision or Merge/Branch

A diamond symbol used when there are at least two alternate paths for the user to choose from.

Action/Control Flow

Shown by an arrow connecting one action box to another.

  • Used to split one activity flow into two or more concurrent activities.
  • Used to join multiple concurrent activities into one or multiple outgoing flows.
Flow final

The end of a specific process flow, but not the end of all activity.


Completion of all process flows.

EdrawMax tips: some people use a fork in their diagram, but forget to add in a join node. Make sure all forks have a join, and vice versa.

How to Draw An Interaction Overview Diagram in EdrawMax?

EdrawMax’s intuitive software allows you to create your own interaction overview diagrams. Whether it’s a basic or complex one, follow this outline to create one that fits your needs.

  • Step 1: In your browser, visit https://www.edrawmax.com/online/ to access the online version, or download the desktop version at https://www.edrawsoft.com/download-edrawmax.html
  • Step 2: In the white sidebar, click on Software Development. Then, click on the UML Modelling box that appears near the top of the screen.
  • Step 3: Choose a template, or click on the UML Modelling box with the “ + ” to open a new document.
  • Step 4: The symbol library can be found to the left of the screen. Scroll down further to find more UML-related symbols. Once you’ve selected the symbols you need, click ‘OK’ and add the shapes to the toolbar on the left.
  • Step 5: Simply drag the components you need from the symbol library onto the blank document to start creating. Each element can be moved, resized, or customized to fit your needs.

Interaction Overview Diagram Examples

Diagram 1: Creating a sale record for an online order Vellum paper for sale.

This is an example of creating a sale record for an online order.

Diagram 2: Hotel room booking procedure

This is an example about the hotel room booking procedure.

Diagram 2: Registering for an online course

This is an example of registering for an online course.

Interaction Diagramm


Interaction Diagram Definition

If you have a system or a piece of software that involves multiple interaction diagrams working together at once, then an interaction overview diagram is the best tool at your disposal. As the name suggests, it gives you a broken-down, bird's eye view of otherwise complex diagrams. Use EdrawMax’s diagram software tool to create your own interaction overview diagrams now!