One model is product quality assurance with the Internal Model Control System / ICS (Internal Assurance System). ICS itself is literally a documented quality assurance system, which permits the certification body to delegate the annual inspection of all group members individually to institutions / units of service that has been certified.
That must be understood is that quality assurance of products designed by the group is to convince consumers that they produce quality products is in accordance with production standards and standards of consumer products required.