Increasingly, the archives of 20th century architecture are attracting the interest of scholars as a source for in-depth understanding of architectural works and the trajectories of artistic movements and individual designers. The autograph drawing, in the different phases of the elaboration of the project, uses methods and techniques that reveal the link with the architectural language. The rediscovery, analysis, highlighting and interpretation, with traditional and innovative tools and techniques typical of the discipline of representation, can contribute to the recognition of architectural archives as Cultural Heritage. The authors of this proposal are following this path about the drawings of Aldo Morbelli’s archive, consulting them extensively, identifying characteristics and peculiarities and, finally, choosing a case study, through which to test the heuristic potential of representation for analysis and interpretation of the design. In this paper we propose graphic, manual and digital analyses related to the design of “Due case a Capri” (1942).