The binding legal principles established are: (1) Section 7(2)(a) of PAJA creates a mandatory requirement that internal remedies provided in other legislation must be exhausted before judicial review can be instituted, unless exceptional circumstances exist under section 7(2)(c). (2) The constitutional right to written reasons under section 33(2), read with section 5 of PAJA, applies to administrative decisions that adversely affect rights, even where specific statutory review procedures do not expressly mandate provision of reasons. (3) What constitutes "adequate reasons" must be assessed objectively based on the circumstances of each case, including the factual context, nature and complexity of the decision, and whether the reasons enable a meaningful challenge through available remedies. Reasons need not be exhaustive but must be intelligible and informative to explain why the decision is justified. (4) The mere lapsing of the time period for exercising an internal remedy does not constitute exhaustion of that remedy. A person must take reasonable steps in good faith to utilize available internal remedies. (5) Where legislation provides a tailored internal remedy for a specific administrative decision (such as section 8(1) of the Immigration Act for persons found to be illegal foreigners), that remedy must be exhausted before resorting to PAJA judicial review. (6) Internal remedies must be available, effective and adequate. An aggrieved party frustrated in good faith attempts to exhaust remedies may establish exceptional circumstances warranting exemption under section 7(2)(c).