We now have the tools which allow us starting from fluxes observed supernovæ of the Ia type to adjust the lightcurves and to determine the useful quantities to make measurements of distance (the magnitudes to the maximum of luminosity in the reference frame of the supernova, the factor of stretching). The adjustment while taking into account all the systematic effects related to measurement (Galactic absorption, difference of filter, K-correction...) makes it possible to minimize the successive corrections which must be made to determine the relevant parameters.
The comparison between our results and the analyses independent of the lightcurves of 25 close supernovæ carried out by knop2003 enabled us to validate the whole of the procedures of adjustment. We finally checked on a remote supernova common to both analyses that all the procedure since measurements of photometry was correct.
We are able from now on to make measurements of distance which will give access to us the cosmological parameters.