(40)The harmonisation of legislation in the field of professional qualifications in inland navigation in Europe is facilitated by close cooperation between the Union and the CCNR, and by the development of CESNI standards. The CESNI, which is open to experts from all Member States, draws up standards in the field of inland navigation, including standards for professional qualifications. European River Commissions, relevant international organisations, social partners and professional associations should be fully involved in the design and drawing up of CESNI standards. Where the conditions laid down in this Directive are met, the Commission should refer to CESNI standards when adopting implementing and delegated acts in accordance with this Directive.