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METIS, the Mid-infrared ELT Imager and Spectrograph (formerly called MIDIR),is a proposed instrument for the European Extremely Large Telescope (E-ELT),currently undergoing a phase-A study. The study is carried out within theframework of the ESO-sponsored E-ELT instrumentation studies. METIS will bedesigned to cover the E-ELT science needs at wavelengths longward of 3um, wherethe thermal background requires different operating schemes. In this paper wediscuss the main science drivers from which the instrument baseline has beenderived. Specific emphasis has been given to observations that require veryhigh spatial and spectral resolution, which can only be achieved with aground-based ELT. We also discuss the challenging aspects of backgroundsuppression techniques, adaptive optics in the mid-IR, and telescope siteconsiderations. The METIS instrument baseline includes imaging and spectroscopyat the atmospheric L, M, and N bands with a possible extension to Q bandimaging. Both coronagraphy and polarimetry are also being considered. However,we note that the concept is still not yet fully consolidated. The METIS studiesare being performed by an international consortium with institutes from theNetherlands, Germany, France, United Kingdom, and Belgium.

METIS - the Mid-infrared E-ELT Imager and Spectrograph