A consultant may be appointed on the basis of expertise and qualification in the following circumstance:
(a) If expertise of high standard is required to carry out a work, or
(b) If the consultancy service is required for a short period or if there is less time to appoint a consultant, or
(c) If only a few consultants are qualified to complete the required work,
(d) If appointment of consultant takes long time but there is inadequate time for it.