Correlations between kinematics and metallicity of bulge stars

Our understanding of the rather complex nature of the Galactic bulge has substantially increased in the last decade, mainly driven by the data provided by recent large scale photometric and high-resolution spectroscopic surveys. The picture that has emerged from this very active research made evident that the Galactic bulge cannot longer be considered as a simple homogeneous structure. As already suggested from the bimodal nature of the metallicity distribution function, the bulge seems to be the product of the spatial coexistence of two groups of metal-rich and metal-poor stars, with different spatial distributions, alpha-enhancements, and seemingly, different ages. In this context, kinematic information for bulge stars of different metallicity provides a fundamental ingredient to disentangle their eventual different origin by revealing their different dynamics. In this talk, I will briefly review the lessons learned from correlating radial velocity with metallicity, as sampled across