How To Change Task Status

A task can have one of the following task statuses:

Name	Description
Not Accepted	A task in any status which has been assigned to its perspective assignee, but not yet accepted or rejected by them.
Not Started	The default status for a new task that has just been created, or for a task that has been accepted.
In Progress	A task which has already been started, but not yet finished.
Declined	A task rejected by its assignee. The task can be reopened, or reassigned.
Deferred	A task, whose completion is postponed for the future.
Completed	A task that has no more work to be done.