Studying Galaxy Evolution with Spitzer and Herschel Cup Conference Series, Vol. **volume**, 2006 Extragalactic Science with Herschel-spire

SPIRE, the Spectral and Photometric Imaging Receiver, is one of three instruments to fly on ESA's Herschel Space Observatory. It contains a three-band imaging photometer operating at 250, 360 and 520 µm, and an imaging Fourier Transform Spectrometer (FTS) covering 200-670 µm. It will be used for many extragalactic science programmes, a number of which will be implemented as Herschel Key Projects. The SPIRE consortium's Guaranteed Time programme will devote more than 1000 hours to Key Projects covering the high-z universe and local galaxies. It is also expected that substantial amounts of Herschel Open Time will be used for further extragalactic investigations. The high-z part of the SPIRE GT programme will focus on blank-field surveys with a range of depths and areas optimised to sample the luminosity-redshift plane and characterise the bolometric luminosity density of the universe at high z. Fields will be selected that are well covered at other wavelengths to facilitate source identifications and enable detailed studies of the redshifts, spectral energy distributions, and infrared properties of detected galaxies. The local galaxies programme will include a detailed spectral and photometric study of a sample of well resolved nearby galaxies, a survey of more than 300 local galaxies designed to provide a statistical survey of dust in the nearby universe, and a study of the ISM in low-metallicity environments, bridging the gap between the local universe and primordial galaxies.