One method of quality control is the Firewall inspection. Sigma Automotive ensures that client information is displayed at production lines, control stations, and where Firewall inspections are conducted, acting as a quality barrier. Non-conformities are included in checklists or for audits. Sigma Automotive supports companies that perform 100% inspections, providing a unique Firewall inspection that ensures each part is checked twice, or 200%.

The Firewall inspection can be followed by quality expertise, which involves detecting product characteristics that are considered unsatisfactory by the clients and determining their causes.

Product-by-product inspection ensures that the batch passing the Firewall inspection achieves a ‘zero defects’ status. Such a level of quality and Firewall inspection is achievable only under special conditions.