The 16th edition of the pocket code "Administrative Procedure" is updated to include Law 4820/2021, which made amendments to the Code of Administrative Procedure (ΚΕΔΕ). The collection includes the basic legislations governing administrative litigation: Presidential Decree 18/1989, Law 2717/1999 (ΚΔΔ), Law 2690/1999 (ΚΔΔιαδ), Law 1406/1983, Law 702/1977, the Code of Administrative Procedure (ΝΔ 356/1974), as well as the provisions of Laws 3900/2010 and 4055/2012 concerning pilot trials and the fair satisfaction of litigants respectively. The Code is an essential and practical publication for both researchers and practitioners of administrative law.