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To get the optimum compromise between large area and depth, good spectral resolution and coverage, we have defined the Advanced Large, Homogeneous Area Medium Band Redshift Astronomical, ALHAMBRA-Survey. It is a photometric survey, along the line proposed by Hickson et al (1994), primarily intended for cosmic evolution studies. We propose to cover a large-area (4 square degrees) with 20 contiguous, equal width, medium band optical filters from 3500 A to 9700 A, plus the three standard broad bands, JHK, in the NIR. Thus, it is placed halfway in between the traditional imaging and spectroscopic surveys. It will make possible the study of many different astronomical problems in a self-contained way.