SSPC-QS 1 requires a coating contractor to implement and document advanced quality control and recordkeeping procedures. As such, the requirements of this standard are intended to supplement the requirements of SSPC-QP 1, SSPC-QP 3, SSPC-QP 6, and SSPC-QP 8. Owners and specifiers who require a higher level of quality control for their projects have the option to require that a contractor qualified to QP 1, 3, 6, or 8 also present evidence that its quality system meets the requirements of QS 1 on projects where an SSPC-QS 1 certification or an equivalent advanced quality management system is required.