# Dataflow model lifecycle

In their lifecycle, models can have 2 statuses: **draft** and **master**.

When created, models are in status **draft**, i.e. they are not associated with incoming dataflows.

At least one [matching criterion](/data-watcher-1.21/model/matching-criteria.md) must be created to promote a dataflow model to master.

Once promoted to master, a dataflow model can be used to enrich incoming dataflows.

**Models in draft status can be edited.**\
**Models in master status cannot be edited.**

To **edit a master dataflow model** from the Dataflow Models page, click the 3 dots icon on the right and select **View Master version**. The master model will be displayed in the Dataflow Modeler. Click the **Open Draft Version** chip. Apply your changes and click **Save**. Click **Promote as Master** to go back to the **Dataflow Models** page.

Let's look at the **Flow Model Lifecycle** from creation (draft status) to delivery (master status):

<figure><img src="/files/0t4GnLFELtQu2JoDg6eB" alt="" width="375"><figcaption></figcaption></figure>

The following menu allows you to manage the Dataflow Model lifecycle:

* **Save**: the model is saved in draft status for further changes.
* **Promote as Master Version**: the model is saved in master status and can no longer be modified.
* **Open Draft Version**: the master model is set to draft and becomes editable. When saving the edited draft version to master, the previous master version will be overwritten.


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