The document summarizes the concrete quality control system used in Australia called P2P (Prescription to Properties) where producers are responsible for mixture design and quality control instead of specifiers. It discusses how the Australian system results in expert producers with well-equipped labs designing mixes to meet requirements. It contrasts this to the US system where specifiers still control mixture designs and variability is much higher. It argues the US should adopt the Australian P2P system to improve quality control and reduce cement usage and greenhouse gas emissions.