The transition from Pop III to Pop II stars

In this contribution, I will review the most recent developments that concern the transition from a primordial, predominantly massive mode of star formation - the Population III stars - to a mode of star formation characterized by the first low mass and long lived stars - the Population II stars. Although the recent observation of a star in the Galactic Halo with a total metallicity of only Z = 4.5x10(-5)Z(circle dot) has demonstrated that stars with masses of approximately similar to 0.8M(circle dot) can form even at these extremely low metallicities, there are many aspects of the Pop III/II transition that are still poorly understood and that certainly require further investigation. For this reason, I have organized my contribution into three fundamental questions which I try to address based on the current theoretical and observational indications.