  The Calar Alto Legacy Integral Field Area survey (CALIFA survey) is providing
Integral Field Spectroscopy (IFS) data in the entire optical window for a
diameter-limited sample of 600 objects in the Local Universe
(0.005$<$z$<$0.03). One of the main goals of this survey is to explore the
spatial distribution of the star formation in nearby galaxies free from the
limitations associated to either UV (dust attenuation) or narrow-band H$\alpha$
imaging (underlying H$\beta$ absorption). These are limitations that have
prevented (until now) carrying out a detailed study of the evolution of the SFR
by components (nuclei, bulges, disks), even locally. This kind of studies are
key, for example, for understanding how galaxies really evolve from the Blue
Cloud to the Red Sequence. We will first discuss in detail the validity of the
assumption that the SFR given by the extincion-corrected H$\alpha$ is a good
measure of the total SFR by means of cross-comparing this with other SFR
estimators, namely the integrated UV+22$\mu$m, UV+TIR,
H$\alpha_{\rm{obs}}$+22$\mu$m, or H$\alpha_{\rm{obs}}$+TIR. Only once these
effects are properly accounted for we can obtain preliminary results from the
spatially-resolved analysis of the contribution of disks to the total SFR in
the Local Universe, as a local benchmark for future studies of disks at high
redshift. Our analysis shows that at least in the Local Universe the H$\alpha$
luminosity derived from observations of the CALIFA IFS survey can be used to
trace the SFR and that the disk to total (disk + bulge) SFR ratio is on average
$\sim$88 $\%$.
