These are organisations that carry out assessments/audits to the relevant Standard(s) on behalf of the Third-Party Independent Accreditation Body; upon a successful audit they can issue a certificate of conformance confirming compliance to the requirements of the relevant Standard. The certificate includes the details of both the Accreditation Body and the certifying organisation. You should ensure that any certifying organisation that you wish to employ is accredited by a reputable Third-Party Accreditation Body. You can review both ASCB and IQS Audits websites for more detailed information. You can also check the certifications of any particular company claiming to be certified by ASCB/IQS Audits Ltd on their website(s).