Main Aims

(1) probe the reionization epoch by robustly determining the luminosity function of Lyman-alpha emitters, Lyman-break galaxies and low luminosity AGNs at z=4-6, 

(2) study galaxy formation and evolution by finding galaxies in a contiguous redshift range between $4 < z <7$, and the evolution of black holes through a census of low-luminosity AGNs

(3) study star-formation and galaxy assembly at its peak at 1<z<2 by identifying emission lines in star-forming galaxies, old populations showing 4000 \AA break, and any linear combination of the two.

(4) allow the deepest unbiased spectroscopy yet for identification of objects to I=27.

(5) enhance the value of the multiwavelength data in UDF and the GOODS CDF-S field to the astronomical community.