More often than not, electronic structure theory is a balancing act. Users must choose between high accuracy at crippling computational cost (as exemplified by coupled-cluster theory or complete active space methods), or low cost at the expense of accuracy (Hartree-Fock theory). Density-functional theory (DFT) occupies a middle space where good accuracy is often possible at low cost, yet robustness and systematic improvability are sacrificed. To achieve better balance of cost versus accuracy, there is interest in amalgamating correlated wave function models with DFT, using the latter to capture dynamical electron correlation at low cost but combining this with a multiconfigurational wave function treatment that captures static correlation.