Shall audits within a process certification always be performed on site and shall sampling follow the same sampling model as for 14001?

It is recommended to at least assess one plant (maximum two) per year, assuring to cover all the product categories within the scope during the validation period of the process certification. The audit is preferably performed on-site but not required. It is also important to consider management system audits from other certification bodies that were performed on the plant during the specific year (i.e. ISO 14001, ISO 9001 or ISO 50001).