I discuss the treatment of initial-state heavy quarks in hadronic
collisions, and its implications for precision LHC
phenomenology. After a brief reviewf of recent issues raised by the
precision treatment of processes
such as Higgs production in bottom quark fusion, I
recall the general ideas underlying matched shemes for heavy quakrs in which
Altarelli-Parisi mass logs are resummed yet the dependence on the
heavy quark mass is retained. I then show how a heavy quark PDF
extracted from data just like light quark PDFs can be accommodated in
such schemes and I argue that such a treatment is both
phenomenologically and theoretically advantageous.
