Customer due diligence (CDD) involves identifying clients, assessing risks, and verifying client identities. It should be performed at the start of relationships and periodically thereafter to understand clients and manage money laundering risks. The key stages of CDD are customer identification, risk assessment, and customer verification. Firms must document their CDD and be able to show regulators that appropriate processes were followed. Failure to perform proper CDD can lead to facilitating money laundering and reputational and regulatory issues for firms.