# Activity Diagram

![Activity Diagram (from uml-diagrams.org)](https://341919671-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSmr4QOrWhRpWh4rhGHZG%2Fuploads%2FdhQ3gfQSW7HbxJU4vXri%2FActivityDiagram.png?alt=media\&token=28fd5469-afb2-4f7e-ac5b-ea32935675ae)

## Create Activity Diagram

To create an Activity Diagram:

1. Select first an element where a new Activity Diagram to be contained as a child.
2. Select **Model | Add Diagram | Activity Diagram** in Menu Bar or select **Add Diagram | Activity Diagram** in Context Menu.

> **See also**
>
> [UML Activity Diagram](http://www.uml-diagrams.org/activity-diagrams.html) - For more information about UML Activity Diagram.

## Action

To create an Action:

1. Select **Action** in **Toolbox**.
2. Drag on the diagram as the size of Action.

You can use **QuickEdit** for Action by double-click or press `Enter` on a selected Action.

* **Name Expression** : Edit name expression.

  *Syntax of Name Expression*

  ```
  expression ::= [ '<<' stereotype `>>` ] [ visibility ] name
  stereotype ::= (identifier)
  visibility ::= '+' | '#' | '-' | '~'
  name ::= (identifier)
  ```
* **Add Input Pin** : Add an input pin.
* **Add Output Pin** : Add an output pin.
* **Add Note** : Add a linked note.
* **Add Constraint** : Add a constraint.
* **Add Trigger Event** : Add a trigger event.
* **Add Outgoing Control Flow** : Add an outgoing control flow with an action.
* **Add Incoming Control Flow** : Add an incoming control flow with an action.
* **Add Outgoing Object Flow** : Add an outgoing object flow with an object node.
* **Add Incoming Object Flow** : Add an incoming object flow with an object node.
* **Add Decision** : Add a decision with two additional actions.
* **Add Merge** : Add a merge with two additional actions.
* **Add Fork** : Add a fork with two additional actions.
* **Add Join** : Add a join with two additional actions.
* **Add Initial Node** : Add an initial node with a connected control flow.
* **Add Final Node** : Add an final node with a connected control flow.

## Trigger

To add a Trigger:

1. Select an Action.
2. Select **Model | Add | Trigger** in Menu Bar or **Add | Trigger** in Context Menu.

## Initial Node

To create an Initial Node:

1. Select **Initial** in **Toolbox**.
2. Click at the position on the diagram.

## Activity Final Node

To create an Activity Final Node:

1. Select **Activity Final** in **Toolbox**.
2. Click at the position on the diagram.

## Fork Node

To create a Fork Node:

1. Select **Fork** in **Toolbox**.
2. Drag on the diagram as the size of Fork.

## Join Node

To create a Join Node:

1. Select **Join** in **Toolbox**.
2. Drag on the diagram as the size of Join.

## Merge Node

To create a Merge Node:

1. Select **Merge** in **Toolbox**.
2. Click at the position on the diagram.

## Decision Node

To create a Decision Node:

1. Select **Decision** in **Toolbox**.
2. Click at the position on the diagram.

## Swimlane (Partition)

To create a Swimlane (Vertical or Horizontal):

1. Select **Swimlane (Vertical)** or **Swimlane (Horizontal)** in **Toolbox**.
2. Drag on the diagram as the size of Swimlane.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/v5/class-diagram#model-element)).

## Interruptible Activity Region

To create an Interruptible Activity Region:

1. Select **Interruptible Activity Region** in **Toolbox**.
2. Drag on the diagram as the size of Interruptible Activity Region.

## Structured Activity Node

To create a Structured Activity Node:

1. Select **Structured Activity** in **Toolbox**.
2. Drag on the diagram as the size of Structured Activity Node.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/v5/class-diagram#model-element)).

## Input Pin

To create an Input Pin:

1. Select **Input Pin** in **Toolbox**.
2. Click on an Action where Input Pin to be attached.

## Output Pin

To create an Output Pin:

1. Select **Output Pin** in **Toolbox**.
2. Click on an Action where Output Pin to be attached.

## Send Signal

To create a Send Signal:

1. Select **Send Signal** in **Toolbox**.
2. Drag on the diagram as the size of Send Signal.

Send Signal is actually an Action whose kind is `sendSignal`.

## Accept Signal

To create an Accept Signal:

1. Select **Accept Signal** in **Toolbox**.
2. Drag on the diagram as the size of Accept Signal.

Accept Signal is actually an Action whose kind is `acceptSignal`.

## Accept Time Event

To create an Accept Time Event:

1. Select **Accept Time Event** in **Toolbox**.
2. Drag on the diagram as the size of Accept Time Event.

Accept Time Event is actually an Action whose kind is `timeEvent`.

## Flow Final Node

To create a Flow Final Node:

1. Select **Flow Final** in **Toolbox**.
2. Click at the position on the diagram.

## Object Node

To create a Object Node:

1. Select **Object Node** in **Toolbox**.
2. Drag on the diagram as the size of Object Node.

You can use **QuickEdit** for Object Node by double-click or press `Enter` on a selected Object Node.

* **Name Expression** : Edit name expression.

  *Syntax of Name Expression*

  ```
  expression ::= [ '<<' stereotype `>>` ] [ visibility ] name
  stereotype ::= (identifier)
  visibility ::= '+' | '#' | '-' | '~'
  name ::= (identifier)
  ```
* **Visibility** : Change visibility property.
* **Add Note** : Add a linked note.
* **Add Constraint** : Add a constraint.
* **Add Outgoing Object Flow** : Add an outgoing object flow with an object node.
* **Add Incoming Object Flow** : Add an incoming object flow with an object node.
* **Add Outgoing Control Flow** : Add an outgoing control flow with an action.
* **Add Incoming Control Flow** : Add an incoming control flow with an action.

## Central Buffer

To create a Central Buffer:

1. Select **Central Buffer** in **Toolbox**.
2. Drag on the diagram as the size of Central Buffer.

You can use **QuickEdit** for Object Node (See [Object Node](#object-node)).

## Datastore

To create a Datastore:

1. Select **Datastore** in **Toolbox**.
2. Drag on the diagram as the size of Datastore.

You can use **QuickEdit** for Object Node (See [Object Node](#object-node)).

## Activity Parameter Node

To create an Activity Parameter Node:

1. Select **Activity Parameter Node** in **Toolbox**.
2. Drag on the diagram as the size of Activity Parameter Node.

If you set the name as blank, the associated parameter's textual notation will be shown as the name.

You can use **QuickEdit** for Object Node (See [Object Node](#object-node)).

## Expansion Region

To create a Expansion Region:

1. Select **Expansion Region** in **Toolbox**.
2. Drag on the diagram as the size of Expansion Region.

You can use **QuickEdit** for Model Element (See [Model Element](https://docs.staruml.io/v5/class-diagram#model-element)).

## Input Expansion Node

To create an Input Expansion Node:

1. Select **Input Expansion Node** in **Toolbox**.
2. Click on an Expansion Node where Input Expansion Node to be attached.

## Output Expansion Node

To create an Output Expansion Node:

1. Select **Output Expansion Node** in **Toolbox**.
2. Click on an Expansion Node where Output Expansion Node to be attached.

## Control Flow

To create a Control Flow:

1. Select **Control Flow** in **Toolbox**.
2. Drag from a node and drop on another node.

You can use **QuickEdit** for Relationship (See [Relationship](https://docs.staruml.io/v5/class-diagram#relationship)).

## Object Flow

To create an Object Flow:

1. Select **Object Flow** in **Toolbox**.
2. Drag from a node and drop on another node.

## Exception Handler

To create an Extension Handler:

1. Select **Extension Handler** in **Toolbox**.
2. Drag from a node and drop on another node.

## Activity Interrupt

To create an Activity Interrupt:

1. Select **Activity Interrupt** in **Toolbox**.
2. Drag from a node and drop on another node.

You can use **QuickEdit** for Relationship (See [Relationship](https://docs.staruml.io/v5/class-diagram#relationship)).