You can assign statuses to checklist items to help you and other users track the progress of tasks. An item can only have one status at a time.
Checklist comes with the following statuses:
N/A: Setting this status automatically checks the item.
In Progress: Setting this status automatically unchecks the item.
Blocked: Setting this status automatically unchecks the item.
To add a status to an item:
Click the Item Status button for the item.
Select a status.