(20)It is appropriate to provide a role for codes of conduct, which enable traders to apply the principles of this Directive effectively in specific economic fields. In sectors where there are specific mandatory requirements regulating the behaviour of traders, it is appropriate that these will also provide evidence as to the requirements of professional diligence in that sector. The control exercised by code owners at national or Community level to eliminate unfair commercial practices may avoid the need for recourse to administrative or judicial action and should therefore be encouraged. With the aim of pursuing a high level of consumer protection, consumers' organisations could be informed and involved in the drafting of codes of conduct.