  A new framework is sketched for the treatment of the hadronisation of a
highly-virtual quark and anti-quark jet pair created in electron-positron
annihilations. As in such a case, factorization theorem does not work, a new
scale-evolution equation is proposed for the fragmentation functions. In this
approach, the virtuality of the leading parton (taken to be equal to the mass
of the jet it induces) is used as fragmentation scale.
