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Clusters allow users to create compound data types by aggregating various and different data types into a single unit.
![media/image12.png](http://www.opentextbooks.org.hk/system/files/resource/8/8091/8121/media/image12.png)
Figure 4.12 Empty Cluster
Select the various data types and drag them onto the cluster structure. Figure Figure 4.13shows an Error Cluster consisting of a Boolean Error, a numeric ID and a string Message data types.
![media/image13.png](http://www.opentextbooks.org.hk/system/files/resource/8/8091/8121/media/image13.png)
Figure 4.13 Cluster Example
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