  Broad absorption lines (BALs) in quasar spectra identify high velocity
outflows that likely exist in all quasars and could play a major role in
feedback to galaxy evolution. Studying the variability in these BALs can help
us understand the structure, evolution, and basic physical properties of these
outflows. We are conducting a BAL monitoring program, which so far includes 163
spectra of 24 luminous quasars, covering time-scales from \sim 1 week to 8
years in the quasar rest-frame. We investigate changes in both the CIV
{\lambda}1550 and SiIV {\lambda}1400 BALs, and we report here on some of the
results from this program.
