  Muon-based facilities offer unique potential to provide capabilities at both
the Intensity Frontier with Neutrino Factories and the Energy Frontier with
Muon Colliders. They rely on a novel technology with challenging parameters,
for which the feasibility is currently being evaluated by the Muon Accelerator
Program (MAP). A realistic scenario for a complementary series of staged
facilities with increasing complexity and significant physics potential at each
stage has been developed. It takes advantage of and leverages the capabilities
already planned for Fermilab, especially the strategy for long-term improvement
of the accelerator complex being initiated with the Proton Improvement Plan
(PIP-II) and the Long Baseline Neutrino Facility (LBNF). Each stage is designed
to provide an R&D platform to validate the technologies required for subsequent
stages. The rationale and sequence of the staging process and the critical
issues to be addressed at each stage, are presented.
