  Parameters are given of 4 TeV and 0.5 TeV (c-of-m) high luminosity muon-muon
Colliders. We discuss the various systems, starting from the proton accelerator
needed to generate the muons and proceeding through muon cooling, acceleartion
and storage in a collider ring. Detector background, polarization are analyzed.
We also look at other type of colliders (hadron, lepton and photon-photon) for
comparison. Technical problems in obtaining increased energy in each type of
machine are presented. Their relative size and probable relative costs are
discussed.
