Section 14(4)(iii) in The Central Motor Vehicles (Accreditation of Bus Body Builders) Order, 2007
(iii)Surveillance: Zonal Accreditation Board shall conduct surveillance assessment once in two years and a re-assessment of the Bus Body Builder before the expiry of the Accreditation Certificate. The Surveillance or Re-assessment, shall be similar to the first assessment. During the validity of Accreditation, the Bus Body Builder shall continuously comply with the requirements of the said order.