The new requirements stated to the school today demand the specialization and professionalization of the school principal, processes where his specialized training has a decisive role. A proposal of foundations is presented for the creation of a theoretical-methodological conception of such training establishing: its singular nature, the need of its development in stages systemically related; its realization through the combination of ways of the postgraduate education, the methodological work and the scientific-pedagogical activity; and its significance as a process where two other sub processes are distinguished: the first one pedagogical, which claims for the application of special didactical-methodological criteria and recommendations, and another managerial, which execution means a group of specific implications