A new extension of the standard coarse graining procedure in statistical physics leads to a new point of view on the (effective) field theories. These theories take a more precise and consistent form. The proposed approach can be used for a systematic treatment of fluctuation (correlation) effects of various length scales. We outline and justify our method by some preliminary calculations. Concrete results are given for the critical temperature the Landau parameters of the *4- theory – the field counterpart of the Ising model. Important unresolved problems of the modern theory of phase transitions – the problem for the calculation of the true critical temperature, and the problem for the ground state properties are considered within the framework of the present approach. Considerable progress of the theory is reported.