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Active galactic nuclei (AGN) are variable on a wide range of timescales,though relatively few systematic variability surveys have been conducted.Previous broad-band (both spectral and temporal) variability surveys of AGN arelimited in their temporal and spectral bandwidth, despite their promise forprobing the central engine and black hole mass. We outline optimal propertiesfor variability studies and provide a brief summary of three new variabilitysurveys, two (BATSS and DASCH) about to begin and the third (EXIST) possiblewithin the next decade, which will open new windows on the physics andfundamental properties of AGN.

AGN Variability Surveys: DASCH from BATSS to EXIST