This publication provides a tool to conduct training for the National Ozone Unit, Customs and relevant Government bodies on how to design and establish national import/export licensing systems for ozone-depleting substances and explains the roles of the relevant stakeholders. All parties to the Montreal Protocol have the obligation to establish a licensing system. Such system is a key element of the regulatory framework and supports all other phase-out efforts for ozone-depleting refrigerants within the country’s Refrigerant Management Plan. Training and certification of the customs officers to prevent illegal trade, detect smuggling schemes and identify illegal imports are included.