This allows for the optimization of a valence basis set without the need for matching ECPs and reduces the number of parameters in the basis set optimization. In novel SQM methods, the semi-core basis functions can be discarded, resulting in a consistent adaptive q-vSZP basis set for the valence region. Similar to the first q-vSZP version, polarization functions on first-and second-row elements might also be dropped for specific SQM methods to reduce the number of parameters and the computational effort.