Once an issue is created, the assignee has the option to accept the issue to put it in progress or to close it. To refuse the issue, these roles can remove themselves directly in the list of assignees.
Once accepted, the assignee does the required work until the issue is ready to be completed.
Once completed, the owner, administrator or power collaborator can close the issue themselves. If the issue was completed by mistake or needs to be redone, they can use the Retract button to put it back to in progress.
Once the issue has been closed, it can be reopened if needed which will put it back to Open
If the issue was completed by mistake or needs to be redone, the Retract button can be used to put it back to in progress.