When an administrative functionary is entrusted with a discretion, the weight to be attached to particular factors, or how far a particular factor affects the eventual determination of the issue, is a matter for the functionary to decide, and provided he acts in good faith, reasonably and rationally, a court of law cannot interfere. A review is not concerned with the correctness of a decision made by a functionary, but with whether he performed the function with which he was entrusted. When the law entrusts a functionary with a discretion, it gives recognition to the evaluation made by that functionary, and it is not open to a court to second-guess his evaluation. The role of a court is no more than to ensure that the decision-maker has performed the function with which he was entrusted. 'Departmental bias' - where administrative officials uphold general policies of their department - is unavoidable and desirable for good administration and does not prevent officials from being fair and objective in particular cases. A functionary is entitled to refuse an application because it conflicts with pre-determined policy, provided the functionary brings an open mind to the matter and does not treat policy as a binding rule to which he is bound.