Activity diagrams are supported in Astah Professional, UML, SysML, and System Safety products.

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Initial Node

You can create an initial node by selecting it from the tool palette.

If you’d like to allow only one initial node in a diagram, go to [Tools] – [System Properties] – [UML] and enable the option below:
Activity Diagram - Initial Node

※ This option is not available in Astah System Safety.

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You can create an action just by double-clicking on a diagram or any other ways that are described in the Diagram Editor page.

You can also insert an action by placing a new or existing action directly on the transition line.
Inserting Actions

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Show Actions on the tree

By default, actions won’t appear on the Structure Tree. So in order to show them in the diagram, you need to change the setting from [Tools] – [System Properties] – [Project View].

You can find this option from [Tools] – [System Properties] – [SysML] – [Project View] in Astah System Safety.

Actions on tree


You can show Actions in the tree view, however, you cannot drag it to diagram from the tree view.

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Show Actions in icon

※This is available in Astah Professional only.

You are able to switch actions to any image files you upload to Astah.
(Diagram reference: Business Process Model and Notation, v2.0 by OMG | Figure 9.32)

  1. Create an activity diagram with actions.

  2. Select a root package in the tree view and open [Profile Stereotype] tab at the bottom pane, then click [Add] button.

  3. Upload an image file, enter the stereotype you want this image to be associated with, and choose [Action] as a type.

  4. Add a stereotype to an action.

  5. Right-click the action and select [Icon Notation] – [Customized Icon].

  6. Then the action will be switched to an image.

    You can add as many icons as you need. Also, you can access the stereotype profile from [Tools] – [Project Settings] – [Set Icon for Stereotype].
    Add stereotype icons

    * Currently, you cannot embed an image inside the action.

    What you can do is drag & drop an image file to a diagram, select [Insert the image file] option and place it to where you want it to be.

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Call Behavior Action

Call Behavior Action is a call action that invokes a behavior directly rather than invoking a behavioral feature that, in turn, results in the invocation of that behavior. The argument values of the action are available to the execution of the invoked behavior. The execution of the call behavior action waits until the execution of the invoked behavior completes and a result is returned on its output pin. In particular, the invoked behavior may be an activity.

How to create a Call Behavior Action

  1. Click on a “Call Behavior Action” on a toolbar and click a diagram.
  2. Double-click on a Call Behavior Action, then you will be asked if you’d like to create a new Activity diagram. Click [Yes].

If you already have an Activity diagram you’d want it to turn to Call Behavior Action

From the tree view, drag the Activity diagram to another opened Activity diagram to insert the Activity diagram as a call behavior action.

Or, you can select which Activity diagram to be associated with a call behavior action from the [Action] tab on its property view.

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Eriksson-Penker Notation

You can use Eriksson-Penker notations in Activity diagrams in Astah Professional and UML Editions.

Eriksson-Penker Process Modeling

Process, Signal Receipt, Signal Sending

Create an Action, and adding <<process>>, <<signal receipt>> or <<signal sending>> stereotypes to the action will automatically change the notation.

This is available in Astah Professional and UML Editions only.

Information Class

  1. Create an ObjectNode.
  2. Add a Class with <<information>> stereotype as its base class to the Object Node.

  3. Select the ObjectNode and choose [Icon] from the top main menu.

  4. Then the ObjectNode will turn into the notation below.
    Information Class
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We will be updating this page with more content soon!

We will be adding more contents soon!
Please let us know if you have any questions about Activity diagrams and if you’d like to know any TIPS about Activity diagrams!