Yes. The process includes annual surveillance audits and a periodic re-assessment. The two most common processes for surveillance audits are one surveillance audit annually or two surveillance audits annually at approximately six-month intervals. The total number of audits days annually is usually the same in either case, as this is established by IAF Guidance, and should total about one-third of the days required for the initial audit.
A re-assessment audit is also required. Normally this occurs in the third year of a certification cycle, with an audit duration of about two-thirds the number of days required for the initial audit; this is also established by IAF Guidance.
IAF guidance allows flexibility in the frequency of the audits and audit duration. The CB is responsible for assuring that the surveillance and re-assessment program is sufficient to verify continued conformance of a certified organization. ANAB requires the CB to have documented justification for any variation from the surveillance and re-assessment audit frequency and duration specified in the IAF Guidance.
It's important to note that some CBs issue certificates for three years with an expiration date. Others do not include an expiration date on the certificate and it is considered valid unless withdrawn. Both of these are acceptable options. In all cases with either system, if there is any question about the validity of a current certificate, one should contact the CB directly.