An administrative authority must follow the statutory procedures prescribed by law when cancelling or withdrawing offer letters for land allocation. Where an appeal is filed under section 61(1)(b) of the Land Commission Act, such appeal suspends the operation of the decision being appealed against, and the administrative authority cannot proceed to implement the decision or issue new allocations until the appeal is properly heard and determined. Administrative authorities must comply with the principles of administrative justice under section 3(1)(2) of the Administrative Justice Act by acting lawfully, reasonably, in a fair manner, providing adequate notice, affording reasonable opportunity to make representations, and providing written reasons for decisions. Internal administrative documents do not constitute a formal determination of an appeal. Procedural issues such as compliance with time limits for filing appeals must be dealt with within the appeal process itself and cannot be raised for the first time as a defence in review proceedings to avoid determining the appeal on its merits.