(1) A directive may provide for the circumstances in which a public service officer may be appointed on contract for a fixed term.
(2) Appointment as a public service officer is on tenure unless--
(a) the officer's chief executive decides the appointment may be on contract for a fixed term; and
(b) the chief executive declares the officer's position to be available on contract for a fixed term.
(3) In making the decision the chief executive must comply with any relevant directive.