QUESTION: If multiple sites are on the same API Q1 Certification, are all sites audited on an annual basis? I know with ISO 9001 they sample audit the facilities, meaning some are audited one year and others the next year. Question asked by J. Psencik REPLY: Thanks for contacting ATCS. With regard to your question, the API performs annual full system audits at facilities that are registered under API Spec Q1, ISO 9001, ISO TS29001,