What can see:
In the Tasks section
All tasks where his group, another employee from his group, or himself is the executor or creator.
NEW tasks to his group unassigned, where he is the executor or creator.
In the Staff section
Sees All Groups
Sees All Employees
What can do with the task:
Creation: for any service and staff member
Change status: if he is the creator or executor, or a task for his group without an executor
Edition: all fields in tasks created by him
Reassignment: only tasks where he is an executor to any employee of any group.