Eligible businesses must apply to participate in C-TPAT. There is an online electronic application on www.cbp.gov that includes submission of corporate information, a supply chain security profile, and an acknowledgment of an agreement to voluntarily participate. In completing the supply chain security profile, companies must conduct a comprehensive self-assessment of their supply chain security procedures using the C-TPAT security criteria guidelines jointly developed by CBP and the trade community for their specific enrollment category.