Evolution of star forming dwarf galaxies: Characterizing the star
  formation scenarios
  We use the self-consistent model technique developed by Mart\'in-Manj\'on et
al. (2008) that combines the chemical evolution with stellar population
synthesis and photo-ionization codes, to study the star formation scenarios
capable of reproducing the observed properties of star-forming galaxies.
  The comparison of our model results with a database of HII galaxies shows
that the observed spectra and colors of the present burst and the older
underlying population are reproduced by models in a bursting scenario with star
formation efficiency involving close to 20 per cent of the total mass of gas,
and inter-burst times longer than 100 Myr, and more probably around 1 Gyr.
Other modes like gasping and continuous star formation are not favored.
