The word "certified" is used for FAPs where certificates are issued (all standards and Nurture Module add-on).
The word "assessed" is used for GRASP, instead of "audited".
For other add-ons (excluding GRASP) we refer to "audits" (so producer are audited) , but as they get a LoC, their production processes are not "certified" but "compliant with e.g. SPRING add-on".