Ab initio methods for intermolecular interactions: Developments and applications Alston J. Misquitta, Gareth W. A. Welch, Anthony J. Stone & Sally L. Price Recent developments in the theory of intermolecular interactions have opened up a new world of applications to an initio methods. Using a perturbation theory based on densityfunctional theory called SAPT(DFT) and very recent methods for computing molecular moments, polarizabilities and dispersion coefficients in distributed form, we are able to construct accurate ab initio potentials for fairly large systems with relative ease. These potentials include many-body interactions and are therefore suitable for the condensed phase. I will outline these developments and present some of our first results in organic crystal structure prediction, as well as calculations of the polarization contribution in organic crystals.