  Despite the enormous success and popularity of density-functional theory,
systematic verification and validation studies are still limited in number and
scope. Here, we propose a protocol to test publicly available pseudopotential
libraries, based on several independent criteria including verification against
all-electron equations of state and plane-wave convergence tests for phonon
frequencies, band structure, cohesive energy and pressure. Adopting these
criteria we obtain curated pseudopotential libraries (named SSSP or standard
solid-state pseudopotential libraries), that we target for high-throughput
materials screening ("SSSP efficiency") and high-precision materials modelling
("SSSP precision"). This latter scores highest among open-source
pseudopotential libraries available in the $\Delta$-factor test of equations of
states of elemental solids.
