# 5. Data Model

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Unable to see the Object Classes in the Data Model menu? This may be the case when you have downloaded Apps from Farmers Market. Change the filter in the top-section of the Data Model, to reveal the *scoped* Object Classes! You may read more [here](https://docs.appfarm.io/reference/data-model#filtering-the-global-data-model).
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## Background,

Are you new with the concepts of databases and data modeling? Take a look at the Data modeling 101 article below.

[data-modeling-101](https://docs.appfarm.io/appcademy/background/databases/data-modeling-101 "mention")