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In search for a synthetic understanding, a scenario for the evolution of thestar formation rate and the chemical abundances in galaxies is proposed,combining gas infall from galactic halos, outflow of gas by supernovaexplosions, and an oscillatory star formation process. The oscillatory starformation model is a consequence of the modelling of the fractional masseschanges of the hot, warm and cold components of the interstellar medium. Theobserved periods of oscillation vary in the range $(0.1-3.0)\times10^{7}$\,yrdepending on various parameters existing from giant to dwarf galaxies. Theevolution of metallicity varies in giant and dwarf galaxies and depends on theoutflow process. Observed abundances in dwarf galaxies can be reproduced underfast outflow together with slow evaporation of cold gases into hot gas whereasslow outflow and fast evaporation is preferred for giant galaxies. Thevariation of metallicities in dwarf galaxies supports the fact that low rate ofSNII production in dwarf galaxies is responsible for variation in metallicityin dwarf galaxies of similar masses as suggested by various authors.

Episodic Model For Star Formation History and Chemical Abundances in Giant and Dwarf Galaxies