  The Collins fragmentation function is extracted from HERMES data on azimuthal
single spin asymmetries in semi-inclusive deeply inelastic scattering, and
BELLE data on azimuthal asymmetries in electron positron annihilations. A
Gaussian model is assumed for the distribution of transverse parton momenta and
predictions are used from the chiral quark-soliton model for the transversity
distribution function. We find that the HERMES and BELLE data yield a
consistent picture of the Collins fragmentation function which is compatible
with COMPASS data and the information previously obtained from an analysis of
DELPHI data. Estimates for future experiments are made.
