(1) The competent authority may, subject to this Act and any regulations made thereunder, and having regard to the fairness and efficiency of the procedures under this Part, Part 2C, Part 2E and Part 2G, prepare and make guidelines with respect to any matter provided for in or under this Part or Part 2C, 2E or 2G, including in relation to-

(a) the conduct of oral hearings,

(b) the imposition of administrative sanctions (including the factors applicable to any order or administrative financial sanction to be imposed under section 15X and the method of calculation of administrative financial sanctions and periodic penalty payments),

(c) the conduct of investigations,

(d) the general policies of the competent authority, and

(e) any matter prescribed by the relevant Minister under this Part, Part 2C, Part 2E or Part 2G.

(2) In making a decision under section 15X, an adjudication officer shall-