# Managers

## Overview


`OHIF` uses `Managers` to accomplish various purposes such as registering new services, dependency injection, and aggregating and exposing `extension` features.

`OHIF-v3` provides the following managers which we will discuss in depth.

{% include "./_managers.md" %}





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[core-services]: https://github.com/OHIF/Viewers/tree/master/platform/core/src/services
[services-manager]: https://github.com/OHIF/Viewers/blob/master/platform/core/src/services/ServicesManager.js
[cross-cutting-concerns]: https://en.wikipedia.org/wiki/Cross-cutting_concern
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