  A focal point for the HEMC'99 workshop was the evaluation of straw-man
parameter sets for the acceleration and collider rings of muon colliders at
center of mass energies of 10 TeV and 100 TeV. These self-consistent parameter
sets are presented and discussed. The methods and assumptions used in their
generation are described and motivations are given for the specific choices of
parameter values. The assessment of the parameter sets during the workshop is
then reviewed and the implications for the feasibility of many-TeV muon
colliders are evaluated. Finally, a preview is given of plans for iterating on
the parameter sets and, more generally, for future feasibility studies on
many-TeV muon colliders.
