Heavy Quarks: Lessons Learned from HERA and Tevatron
  We review some of the recent developments which have enabled the heavy quark mass to be incorporated into both the calculation of the hard-scattering cross section and the PDFs. We compare and contrast some of the schemes that have been used in recent global PDF analyses, and look at issues that arise when these calculations are extended to NNLO. 
Fredrick Olness, Ingo Schienbein