For meta-GGAs, which depend on the occupied orbitals via the Kohn-Sham kineticenergy density, with τ KS (r) = 1 2 i |∇ψ i (r)| 2 , Della Sala and coworkers have developed dedicated approximations for the NAXC. These rely on a model of τ KS (r) as an explicit functional of the local electron density. Initially, they explored the use of linear combinations of the Thomas-Fermi and von Weizsäcker kinetic-energy densities as well as the kinetic-energy density of the revAPBEK approximation in combination with a Laplacian-dependent term . They found that such NAXC approximations clearly improve compared to the use of a GGA for the NAXC. Subsequently, they proposed a Laplacian-dependent model of the form τ KS ≈ τ TF (1 + as + bq), where s is the reduced density gradient, q is the reduced Laplacian, and a and b are optimized parameters .