# 3.1.5: Activate Element

The activation state of an element can be controlled with the **“Activate Element”**-component (see fig. 3.1.5.1). This component expects a model and a list of boolean values as input. The list of true/false values will be mapped to the activation status of the elements in the model. **“True”** corresponds to active, **“False”** to inactive. Section [3.5.9](/3-in-depth-component-reference/3.5-algorithms/3.5.9-beso-for-beams.md) shows, how the **“Activate Element”**-component enables one to view the solution history of the iterative **“BESO for Beams”**-algorithm.

{% hint style="info" %}
Karamba3D sets elements inactive by giving them a very weak material with zero weight.
{% endhint %}

{% file src="/files/tHBgnO6t4opBHYxv1tZQ" %}

<figure><img src="/files/8yfDn7KroyyVS1y8LoCe" alt=""><figcaption><p>Fig. 3.1.5.1: Setting the activation state of all elements of a model with a list of boolean values.</p></figcaption></figure>

{% file src="/files/yuaE4paqAdt2ARG8Aq02" %}


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