  WST - Widefield Spectroscopic Telescope: We summarise the design challenges
of instrumentation for a proposed 12m class Telescope that aims to provide a
large (>2.5 square degree) field of view and enable simultaneous Multi-object
(> 20,000 objects) and Integral Field spectroscopy (inner 3x3 arcminutes field
of view), initially at visible wavelengths. For the MOS mode, instrumentation
includes the fiber positioning units, fiber runs and the high (R~40,000) and
low (R~3,000 - 4,000) resolution spectrographs. For the MUSE like Integral
Field Spectrograph, this includes the relay from the Telescope Focal Plane, the
multi-stage splitting and slicing and almost 150 identical spectrographs. We
highlight the challenge of mass production at a credible cost and the issues of
maintenance and sustainable operation.
