  Properties of CFRS field galaxies up to z=1 are discussed. Estimations of the
cosmic star formation rate (SFR) lead to serious problems if they not account
for AGN emissions and for light reemitted at IR wavelengths. Deep ISOCAM and
VLA photometries on one CFRS field have been performed. Multi-wavelength
analyses from UV to Mid-IR and hence to radio allow us to classify sources from
their spectral energy distributions. This provides an estimation of the FIR
luminosity density related to star formation. The deduced SFR density is free
of extinction effects and not contaminated by AGN emissions. About 55+/-20% of
the star formation at z<=1 is related to FIR emission. If a non truncated
Salpeter IMF is adopted, the derived stellar mass formed from z=0 to z=1 seems
too high when compared to the present day stellar mass.
  An important fraction (30%) of the star formation at z=0.5-1 seems to be
related to the rapidly evolving population of compact/Irr galaxies. Larger
systems found at z=1, show a slower evolution of their star formation
properties.
