Activity Diagram

About

An Activity Diagram represents workflow or process flow in a system, describing sequential and parallel actions. It is widely used for business logic modeling and process visualization.

Refer to the official documentation for more details - https://plantuml.com/activity-diagram-beta

Key Elements

1. Start & End Nodes

   • Represented by a black circle (start) and encircled black dot (end).

2. Actions (Activities)

   • Represented as rounded rectangles.

   • Each action represents a step in the workflow.

3. Transitions (Arrows)

   • Show the flow of execution between activities.

4. Decision Nodes

   • Diamond shape, used for if-else conditions.

5. Fork & Join Nodes

   • Represent parallel processing (splitting/joining flows).

6. Swimlanes

   • Separate responsibilities of different entities in the process.

1. User Registration Process

This represents the User Registration Process in a web application.

• Start (start) and End (stop) nodes.

• Decision (if ... then ... else): Validates user input.

• Actions (: ActionName;): Represents different activities.

@startuml
title User Registration Process - Activity Diagram

start
:User Enters Details;
if (Are details valid?) then (Yes)
    :Save to Database;
    :Send Verification Email;
    if (Email Verified?) then (Yes)
        :Activate Account;
    else (No)
        :Show Error;
    endif
else (No)
    :Show Validation Errors;
endif
stop

@enduml