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H.R. Miller (Georgia State University)
Blazars are among the most variable AGN observed at optical wavelengths. Rapid, large-amplitude variations, with time- scales significantly shorter than a day, are common for these objects. A summary of recent observational results will be presented along with a discussion of the character of the variations. The impact of these observations on our understanding of the emission processes and structure of the emitting region will be discussed in light of the con- straints imposed by these rapid variations. A discussion of the constraints imposed by variations detected on timescales ranging from days to decades will also be included. The relationship of microvariability to the longer timescale variability will be discussed.