---
title: Adding Swimlanes (Partitions) in Astah
description: Learn how to add, orient, and rename swimlanes (partitions) in Astah for Activity Diagrams and State Machine Diagrams.
---
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# Adding Swimlanes (Partitions) in Astah
In Astah, "Swimlanes" are technically referred to as **Partitions**. These are used to organize actions or states by responsibility or stage within Activity Diagrams and State Machine Diagrams.
You can find the tools for creating Partitions in the **Tool Palette** located on the the diagram editor.
- **Vertical Lanes:** Select the **\[Partition (Vertical)\]** icon.
- **Horizontal Lanes:** Select the **\[Partition (Horizontal)\]** icon.
Once selected, click anywhere on the diagram to place the Partition. To add additional Partitions to an existing set, click inside an existing partition.
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