  We review recent progress in the development of an approach valid to any
order which unifies the fixed-order DGLAP evolution of fragmentation functions
at large x with soft-gluon logarithmic resummation at small x. At leading
order, this approach, implemented with the Double Logarithmic Approximation,
reproduces exactly the Modified Leading Logarithm Approximation, but it is more
complete due to the degrees of freedom given to the quark sector and the
inclusion of the fixed-order terms. We find that data from the largest x values
to the peak region can be better fitted than with other approaches. In
addition, we develop a treatment of hadron mass effects that leads to
additional improvements at small x.
