> For the complete documentation index, see [llms.txt](https://documentation.crossengage.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.crossengage.io/predictions-platform/data-model/activities.md).

# Activities

To improve model and forecasting quality, you can upload additional tables that contain specific activities and interactions with your customers. These tables must each contain at least a unique customer ID, a timestamp, and an activity type. Additionally, an activity\_id can be passed that links the activity to a specific action. However, this data is not required for an initial well working model and is therefore optional.

You can upload one or more of these tables:

* Online activities (customer in login area on your website / click in email)
* Inbound activities (customer calls call center, letters and emails from customer)
* Outbound activities (print mailings, catalogs, calls from a call center)
* Payment activities (customer pays an invoice, receives a dunning level, is referred to collections)

{% hint style="info" %}
In order to make use of these activities in the modelling process, it is important that they are stored in the so-called event format (just like transactions). This means that each row in an activity table describes exactly one 'event' at a time with a customer.
{% endhint %}

<table><thead><tr><th width="162">Field Name</th><th width="125">Data Type</th><th>Example</th><th>Description</th></tr></thead><tbody><tr><td>*customer_id</td><td>string</td><td>e131498</td><td>The Customer ID; Unique identifier used for merging all tables.</td></tr><tr><td>*activity_timestamp</td><td>date</td><td>2015-01-13</td><td>Date and (optionally) Time of the Transaction</td></tr><tr><td>*activity_type</td><td>string</td><td>CartAdd<br>CartCancel</td><td>Used to generate patterns for the most common types.</td></tr><tr><td>activity_subtype</td><td>string</td><td>Trousers Black<br>4RTR3022DS</td><td>Can be used to generate additional patterns.</td></tr></tbody></table>