  A summary of measurements of the fragmentation of charm quarks into a
specific hadron is given. Measurements performed in photoproduction and deep
inelastic scattering in $e^{\pm}p$, $pp$ and $e^+e^-$ collisions are compared,
using up-to-date branching ratios. Within uncertainties, all measurements
agree, supporting the hypothesis that fragmentation is independent of the
specific production process. Averages of the fragmentation fractions over all
measurements are presented. The average has significantly reduced uncertainties
compared to individual measurements.
