3) dispõe que "an arbitration agreement shall be in writing”, acrescentando o do mesmo artigo que "An arbitration agreement is in writing if its content is recorded in any form, whether or not the arbitration agreement or contract has been concluded orally, by conduct or by other means.” Donde, à luz da lei de Singapura, a adesão à cláusula compromissória pode fazer-se por declaração oral ou resultar de comportamentos concludentes.