> For the complete documentation index, see [llms.txt](https://docs.enlyze.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enlyze.com/en/production-optimization/downtimes/defining-reasons.md).

# Defining downtime reasons

To analyze machine downtimes, downtime reasons must first be configured in the ENLYZE App. Setting up reasons early enables consistent classification when [assigning reasons](/en/production-optimization/downtimes/assigning-reasons.md).

{% hint style="info" %}
What the three downtime categories (Planned, Unplanned, No Production Planned) mean and why assignment matters is explained under [Categories & assignment (Concepts)](/en/concepts/downtimes/categories-and-assignment.md).
{% endhint %}

## Prerequisites

Before defining downtime reasons, [downtime detection](/en/production-optimization/downtimes/detection.md) must be configured for the relevant machine.

## Configure reasons

{% stepper %}
{% step %}

#### Open downtime reasons

Navigate to **Settings > Reasons for downtime**.
{% endstep %}

{% step %}

#### Add reasons

Add downtime reasons under the appropriate category (**Planned**, **Unplanned**, **No Production Planned**). Optionally, organize reasons into groups for better manageability.

<figure><img src="/files/GoCESemwKll3Bi1tEkqu" alt=""><figcaption></figcaption></figure>
{% endstep %}

{% step %}

#### Save

Click **Save** to apply your changes.
{% endstep %}
{% endstepper %}

## Related topics

* [Assign reasons to downtimes](/en/production-optimization/downtimes/assigning-reasons.md): Assign reasons to detected downtimes.
* [Categories & assignment](/en/concepts/downtimes/categories-and-assignment.md): Background on the three downtime categories.