The overall performance of these methods is illustrated in Table using several noncovalent data sets. Importantly, the DFT calculations used to compute these error statistics were performed at or near the CBS limit, and are compared to benchmark values of ∆E int obtained at the level of coupled-cluster theory with single, double, and perturbative triple excitations [CCSD(T)], also evaluated in the CBS limit. As such, these error statistics probe the inherent accuracy of DFT itself, free from BSSE or BSIE. The data in Table are intended to demonstrate what level of accuracy is presently feasible with available exchange-correlation functionals. In the rest of this work, we will mostly be concerned with convergence to the CBS limit for a particular functional and therefore subsequent error statistics will be defined with respect to that limit (DFT/CBS), rather than comparing to CCSD(T)/CBS results.