  In rational conformal field theory, the Verlinde formula computes the fusion
coefficients from the modular S-transformations of the characters of the chiral
algebra's representations. Generalising this formula to logarithmic models has
proven rather difficult for a variety of reasons. Here, a recently proposed
formalism (arXiv:1303.0847 [hep-th]) for the modular properties of certain
classes of logarithmic theories is reviewed, and refined, using simple
examples. A formalism addressing fusion rules in simple current extensions is
also reviewed as a means to tackle logarithmic theories to which the proposed
modular formalism does not directly apply.
