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# assessmentSessionDidBegin(_:)

Tells the delegate that the session started.

```
optional func assessmentSessionDidBegin(_ session: AEAssessmentSession)
```

## Parameters

`session`

The session that started.

## Discussion

After your app calls a session’s [`begin()`](/documentation/AutomaticAssessmentConfiguration/AEAssessmentSession/begin()) method, the session asynchronously disables the appropriate system services and then calls its delegate’s [`assessmentSessionDidBegin(_:)`](/documentation/AutomaticAssessmentConfiguration/AEAssessmentSessionDelegate/assessmentSessionDidBegin(_:)) method. Only after receiving this callback can you be sure that it’s safe to start an assessment. If the session fails to start for any reason, you receive a call to the [`assessmentSession(_:failedToBeginWithError:)`](/documentation/AutomaticAssessmentConfiguration/AEAssessmentSessionDelegate/assessmentSession(_:failedToBeginWithError:)) method instead.

---

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