  The EAGLE and EVE Phase A studies for instruments for the European Extremely
Large Telescope (E-ELT) originated from related top-level scientific questions,
but employed different (yet complementary) methods to deliver the required
observations. We re-examine the motivations for a multi-object spectrograph
(MOS) on the E-ELT and present a unified set of requirements for a versatile
instrument. Such a MOS would exploit the excellent spatial resolution in the
near-infrared envisaged for EAGLE, combined with aspects of the spectral
coverage and large multiplex of EVE. We briefly discuss the top-level systems
which could satisfy these requirements in a single instrument at one of the
Nasmyth foci of the E-ELT.
