Top: long-term pulse period history of V 0332+53 since its discovery in 1973. Middle: Long-term optical light curve of V 0332+53. All but the IAC80 light curve have been rebinned for clarity. Bottom: type of X-ray outburst undergone by V 0332+53 (i.e. Type II, Intermediate, and Type I). The intensities are the same for outbursts of the same type and have not been corrected for the different energy bands. We only intend to be illustrative of the times and types of events. The long-term evolution of the H_α EW (red filled circles) is also overplotted. The measurements have been extracted from Iye & Kodaira (1985), Kodaira et al. (1985), Corbet et al. (1986), Negueruela et al. (1999), Masetti et al. (2005), Kiziloglu et al. (2008), Goranskij et al. (2010), and the present work.