When you [install tracking via the corresponding NuGet package](🔗), it will result in double tracking, and you should set the `
episerver:personalization.content.DisableDefaultTracking key` to true.
## Add the tracking script
The tracking API call is made asynchronously to have no effect on web page performance
### Cookie usage in Content Recommendations
|**iv**||Tracks the anonymous visitor's actions across the the site. This is a persistent cookie.|
|**is**||Identifies a visitor's session. This cookie is used in conjunction with the iv cookie, and is erased when the visitor closes the browser.|
See [Optimizely Platform Cookies](🔗) for information about other cookies in the Optimizely platform.
The following example uses _Google Tag Manager_, but you can use any other tag management solution.
Your Optimizely onboarding representative emails the tracking script to you.
Log in into Google tag manager (or other tag manager).
Paste the code provided by Optimizely into the (Google tag manager) **HTML** section. (Your tag manager may have a different field.)
To install Optimizely Content Recommendations through Optimizely Content Management System (CMS) or by manually editing a page, copy and paste the code into the tracking code section of _web.config_, or the <head> section of your web page.
Click **Save** to publish the container.
**Related blog post:** [Implementing Idio (Optimizely) analytics and content recommendations on an Episerver (Optimizely) site](🔗) - David Knipe