The trouble of the passage from the immediacy of the ideative drawing to the exactness of the executive drawing is particularly evident in the cases in which the realization of the project foresees the definition of standards, possibly to reproduce in series. In this sense, with specific reference to architectural design, the theme of existenzminimum assumes special importance. The human needs are broken down into limited main functions, distinguishing “typical parts” recognized by precise codes of representation and recomposable in various spatial configurations that meet the needs of economy, modularity and flexibility. Drawing assumes a central role in this framework as a means of verifying the achievement of optimal performance.