15. The duty to give reasons for the refusal of requests arises not only by virtue of the AIE Regulations and Directive but is also recognised generally as a core principle of administrative law and a fundamental element of constitutional justice (see, for example, Meadows v Minister for Justice [2010] IESC 3 and Balz & Anor v An Bord Pleanála & Ors [2019] IESC 90). Both of these judgments, in the same way as the AIE Regulations, make it clear that where a requester has all or part of a request refused, they are entitled to be provided with clear reasons for that refusal. This duty arises so that the requester can take a view as to whether they consider refusal justified, or whether they wish to exercise their entitlement to have the refusal reviewed, whether at internal review stage or through an appeal to this Office.