This type of Task has a single assignment that is shared by any number of team members for a single shared outcome. If this has more than one member assigned, you can think of it as a collaborative or group Task.
It is important to note for a Single Task, work may be recorded, discussed and completed even if no member is yet assigned to the Task. This is different than a Multiple Task.
If a member has been assigned the Task but has not been granted the ability to edit it, the member will be only be able to add comments, notes, reminders and to-dos, and change the Task’s status. Nothing else will be editable by the member.