A Canada Border Services Agency (CBSA) alternative to presenting paper copies of Form B3, the Canada Customs Coding Form. CBSA process 96% of all the B3 forms it receives using the CADEX system. This system also provides importers with access to reports and files to assist in the electronic preparation of Form B3. Importers who receive authorization to use CADEX can electronically transmit their Form B3 information directly to the CBSA computer system. For more information, go to: http://cbsa-asfc.gc.ca/eservices/overview-sommaire-eng.html.