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Although perturbative QCD has progressed much in the last few years, the notion of diquarks is still useful and vital and many short cuts induced by diquarks can still be very efficient for simulating nonperturbative effects in the intermediate energy region (from a few GeV to some 10-20 GeV), where a whole new generation of machines is being planned and will, hopefully, become operative in the near future.

High-energy diffraction has become a hot and fashionable subject in recent years due to the great interest triggered by the HERA and Tevatron data. These data have helped to show the field from a different perspective paving the road to a hopefully more complete understanding than hitherto achieved. The forthcoming data in the next few years from even higher energies (LHC) promise to sustain this interest for a long time. We believe that it is therefore necessary to summarize the main devel opments which have marked the growth of high-energy diffractive physics in recent decades, and to...

High-energy diffraction has become a hot and fashionable subject in recent years due to the great interest triggered by the HERA and Tevatron data. These data have helped to show the field from a different perspective paving the road to a hopefully more complete understanding than hitherto achieved. The forthcoming data in the next few years from even higher energies (LHC) promise to sustain this interest for a long time. We believe that it is therefore necessary to summarize the main devel opments which have marked the growth of high-energy diffractive physics in recent decades, and to...