  We present here a short and subjective review of methods for calculating
charge transfer couplings. Although we mostly focus on Density Functional
Theory, we discuss a small subset of semiempirical methods as well as the
adiabatic-to-diabatic transformation methods typically coupled with
wavefunction-based electronic structure calculations. In this work, we will
present the reader with a critical assessment of the regimes that can be
modeled by the various methods their strengths and weaknesses. In order to give
a feeling about the practical aspects of the calculations, we also provide the
reader with a practical protocol for running coupling calculations with the
recently developed FDE-ET method.
