Leonora Riesenburg C.Arb and Victor Leginsky C.ArbIntroductionThis practice note examines the ‘Without Prejudice’ (WP) principle under the onshore civil law of the United Arab Emirates (‘UAE’), its policy underpinnings, and its application in Dubai-seated arbitration, following the recent Dubai Court of Cassation Case (DCC Case) No. 486/2024.The WP principle has old roots in English common-law. One of the most cited common law decisions on WP in communications, the UK Court of appeal case of Walker v Wilsher (1889) 23 QBD 335 upheld a strict version of WP in the 19th century. By fear that the whole object of the limitation would be destroyed, the Appeal Court concurred, that it would be ill-fated for the courts to allow in evidence the acts of litigants on letters written without prejudice. In the 19th century, no exemption existed in respect to costs. The concept of ‘without prejudice save as to costs’ originated