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We present the PRIsm MUlti-object Survey (PRIMUS), a spectroscopic faintgalaxy redshift survey to z~1. PRIMUS uses a low-dispersion prism and slitmasksto observe ~2,500 objects at once in a 0.18 deg^2 field of view, using theIMACS camera on the Magellan I Baade 6.5m telescope at Las CampanasObservatory. PRIMUS covers a total of 9.1 deg^2 of sky to a depth of i_AB~23.5in seven different deep, multi-wavelength fields that have coverage from GALEX,Spitzer and either XMM or Chandra, as well as multiple-band optical and near-IRcoverage. PRIMUS includes ~130,000 robust redshifts of unique objects with aredshift precision of dz/(1+z)~0.005. The redshift distribution peaks at z=0.6and extends to z=1.2 for galaxies and z=5 for broad-line AGN. The motivation,observational techniques, fields, target selection, slitmask design, andobservations are presented here, with a brief summary of the redshiftprecision; a companion paper presents the data reduction, redshift fitting,redshift confidence, and survey completeness. PRIMUS is the largest faintgalaxy survey undertaken to date. The high targeting fraction (~80%) and largesurvey size will allow for precise measures of galaxy properties andlarge-scale structure to z~1.

The PRIsm MUlti-Object Survey (PRIMUS) I: Survey Overview and Characteristics