  The understanding of the crystal collimation and extraction experiments
performed in the recent decade at CERN SPS, FNAL Tevatron, IHEP U-70 and RHIC
is reviewed from the standpoint of Monte Carlo simulations. The expectations
for the LHC - the crystal efficiency and the requirements to a crystal - are
outlined basing on the same computer model verified in the above experiments.
Finally, we discuss key issues for the future experiments at CERN SPS and
Tevatron aiming to reach the most efficient channeling and to bring these tests
to the future LHC as close as possible.
