  Turbulence in the interstellar medium has been an active field of research in
the last decade. Numerical simulations are the tool of choice in most cases.
But while there are a number of simulations on the market some questions have
not been answered finally. In this paper we are going to examine the influence
of compressible and incompressible driving on the evolution of turbulent
spectra in a number of possible interstellar medium scenarios. We conclude that
the driving not only has an influence on the ratio of compressible to
incompressible component but also on the anisotropy of turbulence.
