In addition to the EcoVadis assessment, HA is regularly assessed by Supplier Assurance. The Supplier Assurance Questionnaire (SAQ) assessment is considered the automotive industry's globally recognized sustainability standard and is used by global OEMs as well as many tier 1 and sub-tier automotive companies.

It is applicable to all suppliers in the automotive supply chain worldwide, including procurement, manufacturing, logistics, assembly and retail. Previously, HA GmbH's manufacturing site in Hanover, Germany, was assessed by NQC using the SAQ 5.0 questionnaire. Again, the result is only valid for a limited period of time and has to be repeated regularly.