Can I internally audit as a one-time event? Is that robust?

The ISO standards do not dictate how you conduct your audits.  They merely require that they are effective.  It has been argued by some ISO proponents that a one-time event cannot be effective.

Cavendish Scott performs internal audits for many organizations.  We are ISO and auditing experts and take all of the problems and worry out of your ISO system.  Outsource your internal audits and relax.

Schedule an ISO Audit