Users can use reviews to give feedback to the Assignees of a batch. Using a review, you can:
Rate the annotation quality (On a scale of 10)
Accept a batch. In this case the batch is marked complete.
Reject the batch. In this case the batch moves back to the Annotation mode.
You can post multiple reviews as you perform Quality Check through various workflows. When creating a new review you can view all the reviews created on the batch.
You can also view the Review history directly from the task page, by clicking on the Review history button for the particular batch.