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Galaxies are factories in which gas gravitationally collapse to form stars. This process is very inefficient: the gas-to-star conversion timescale is ~200 times smaller than the free-fall time. The origin of this inefficiency is one of the main open questions in the field of galaxy evolution. In particular, a novel scenario competes with the usual picture of regulation of star formation by feedback, which is a transition between: - z~0 : regulation of star formation by small scales (stellar feedback) - z~2 (10 Gyrs back) : regulation of star formation by large scales (disk dynamics and accretion)_x0003_ If this transition exists, it should leave chemo-dynamical footprints on stars observed today: the processes dominating this regulation impose different star formation law scalings with the galaxy environment and more than half of the stars in the local Universe formed during the peak of cosmic star formation, at 1
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