a) Using minimal timescale (MTS) and RMS variability to differentiate between BH and NS-binaries, b) deploying the spectral optical index to study the contribution of accretion disks to the optical and X-ray emission in ULXs, c) Identification and classification of optical counterparts of ULXs, d) searching for exoplanets by using the transit timing variations (TTVs) determined from optical lightcurves e) using wavelets to do timing studies of x-ray lightcurves of XRBs