We discuss methods and preliminary results in a search for variable stars in the Carina dSph galaxy. This galaxy presents a complex star formation history and hosts a unique sample of variable stars. We collected B,V time series data during different runs, from 1999 to 2004, with the MOSAICII camera available at 4m CTIO telescope. The methodology is based on correlations between a version of the Welch-Stetson variability index, the variability probability of the Lomb-Scargle periodogram, and general statistical parameters associated with the individual light curves.