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# How do dependencies work?

To define a dependency, click on the circle symbol at the beginning or end of a timeline, hold down the left mouse button and drag it to the desired point. The dependency line is generated. 

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_17ux8h2.png)

To edit a dependency, double-click on the dependency line.  

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_a45agu.png)

A new window opens, where you now have the following options:

With the **chain symbol** (1.) you can determine whether the elements are firmly coupled or decoupled. If they are coupled, they can be moved together and adjust automatically. With the dependency **end-to-beginning** (2.) you can only start with B when operation A has been completed.

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_an4r26.png)

With the dependency **beginning-to-beginning**, operation B can only start when operation A has started. 

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_1exmt4t.png)

If the dependency is **end-to-end**, operation B can only be completed after operation A has been completed.   

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_10iimjb.png)

If the dependency is **Beginning-to-end**, operation B can only be completed once A has started.

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_1643r1b.png)

To delete a dependency, click **X**.

![](https://storage.crisp.chat/users/helpdesk/website/-/7/f/f/e/7ffe47b65f73d800/image_1xmuxqh.png)