To comply, a business must have identified and documented its process for quality and key procedures. Records must be maintained that prove how the company is following its own policies and procedures as written.
Then, the company must successfully complete a registration or compliance audit, performed by an accredited third-party (registrar) to ensure an unbiased assessment. TRACI is an independent Registrar, who will conduct an on-site audit (assessment). The audit verifies that all operations of a facility conform to the ISO 9001 (or related) standards.
For a complete explanation of the registration process, see What We Do (and Don't Do).