  We examine the scale dependence in the resonance region of inclusive ep
scattering. In particular we discuss the invariants other than Q^2, which have
been proposed as a scale for pQCD evolution in a kinematical regime where both
infrared singularities and power corrections are expected to be largest. We
show that the region where most of the present data are available, can be
described using NLO pQCD evolution at fixed invariant mass, W^2, plus a leading
order power correction term. We find that the coefficient of the power
correction at W^2 < 4 GeV^2 is relatively small, i.e. comparable in size to the
one obtained in the large W^2 region.
