# Downtime contextualisation
Providing reasons for machine downtimes is essential for analyzing and improving production performance. At ENLYZE, this process is called **downtime contextualisation**.
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What the three downtime categories (Planned, Unplanned, No Production Planned) mean and why assignment matters is explained under [Categories & assignment (Concepts)](https://docs.enlyze.com/en/concepts/downtimes/categories-and-assignment).
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This guide walks you through assigning reasons to detected downtimes in the ENLYZE platform.
## Prerequisites
Before you start, ensure that:
* **Downtime detection** is configured for the relevant machine :arrow\_right: [#configuring-downtime-detection](https://docs.enlyze.com/en/oee#configuring-downtime-detection "mention")
* **Downtime reasons** have been defined in your ENLYZE configuration :arrow\_right: [defining-reasons](https://docs.enlyze.com/en/production-optimization/downtimes/defining-reasons "mention")
## Accessing the Downtime UI
Downtime contextualisation is performed through the ENLYZE App: [app.enlyze.com](https://app.enlyze.com)
You can access the contextualisation interface in two ways:
1. **Production Overview Panel.** It is located on the app's home page and shows downtimes per machine for the selected time range.
2. **Downtime Section.** Provides the complete list of downtimes across all machines. Use the dropdown in the upper-left corner to filter by machine.
To begin contextualising, simply click on the downtime entry you'd like to edit.
## How to Contextualise a Downtime
The contextualisation interface shows an overview of the selected downtime and the downtime editor:
### Assigning a Reason
* Browse the predefined reasons, organized by categories and groups.
* Click a reason to assign it directly to the downtime.
* Optionally, add a comment for clarification.
* Click **Save** (bottom right) to apply your changes.
* Click **Cancel** (bottom left) to discard your changes and restore the previous state
### Splitting a Downtime
To split a downtime into multiple parts:
1. Click the **scissors icon** below the downtime plot
2. Define time intervals
3. Assign reasons to each segment individually.
Once a downtime is contextualised, the information becomes available in the **ENLYZE Manufacturing Data Platform**. This means it can be used by any connected service or application for reporting, analysis, or optimization.
2. Define time intervals
3. Assign reasons to each segment individually.
