  When combined with the huge collecting area of the ELT, MOSAIC will be the
most effective and flexible Multi-Object Spectrograph (MOS) facility in the
world, having both a high multiplex and a multi-Integral Field Unit (Multi-IFU)
capability. It will be the fastest way to spectroscopically follow-up the
faintest sources, probing the reionisation epoch, as well as evaluating the
evolution of the dwarf mass function over most of the age of the Universe.
MOSAIC will be world-leading in generating an inventory of both the dark matter
(from realistic rotation curves with MOAO fed NIR IFUs) and the cool to
warm-hot gas phases in z=3.5 galactic haloes (with visible wavelenth IFUs).
Galactic archaeology and the first massive black holes are additional targets
for which MOSAIC will also be revolutionary. MOAO and accurate sky subtraction
with fibres have now been demonstrated on sky, removing all low Technical
Readiness Level (TRL) items from the instrument. A prompt implementation of
MOSAIC is feasible, and indeed could increase the robustness and reduce risk on
the ELT, since it does not require diffraction limited adaptive optics
performance. Science programmes and survey strategies are currently being
investigated by the Consortium, which is also hoping to welcome a few new
partners in the next two years.
