# Initialize()

> Initializes the TypeManager with all ECS type information. May be called multiple times; only the first call will do any work. Always must be called from the main thread.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public static void Initialize()
```