Nowadays, we are working in a stimulating scenario where the new digital technologies and the traditional design process in Architecture are definitively mixed together. We know that majority of mistakes in the phase of construction comes from the design phase and this trend looks often to come from a base concept aimed to separate, dramatically, the design activity from the construction activity. The most negative effects were detected in terms of increasing costs and of decreasing of the quality of the buildings. The new computational methodologies can enable us to obtain significant benefits in reducing the gap between designing and building. The new parametric approaches can help to highlight the centrality of the constructive detail. The concept of parameter is, at the same time, logical element and material element, therefore its nature is related to the theory and also to the practice of the Architecture. If we think to the importance of the executive detail, the parametric approach looks like the link between the "bit" and the brick. It is necessary designing the building, according its constructive logic, that is possible only trying to develop a biunique link between the two phases of the process that must be conceived as only one. To think via parametric the constructive details, means knowing that any existing design complexity can be lead back to an original constructive element, this dynamic discloses the sense of the complexity. I think that the digital fabrication represents the first real “bridge” between design and construction, because transforms a digital component in real component. The new technical and cognitive paradigms can be an efficient contribution in order to define a theoretical and practical vision in order to understand "the design of the construction" and "the construction of the design" as one. The next step of that current research will be how to move our vision from the “Architecture as ontology” to the “Architecture as taxonomy”.