the first models, Hensler et al. [@hen04] performed  simulations [@hen03] of spherical low-mass galaxies in order to study galaxy survival, SF epochs and rates, gas loss, and (final) metallicity. They demonstrate that due to the SF self-regulation only short but vehement initial SF epochs occur and lead to mass-dependent gas loss. Nonetheless, the DGs remain gravitationally bound with the further issue that more cool gas survives than it is observed, but it forms a halo around the visual body. Although the stellar energetic feedback is the driving mechanism to expel the gas, its effect is not as dramatic as obtained in semi-analytic models [@sal08] and the amount of unbound mass is considerably lower. To get lost, this gas has to be stripped off additionally [@gre03] what probably happens by means of ram pressure of the galactic halo gas [@may07] or by tidal stripping [@rea06]. Otherwise it can return to the DG and produce subsequent events, from a second SF epoch to SF oscillations. The external gas reservoirs around some dSphs [@bou06], in particular also the that is kinematically coupled with the Scl dSph, might witness this effect.

The fascinating wealth of data and their precision on stellar ages and kinematics, 