Aim:The study asserts that Building Information Modelling (BIM) methods, as a new tool of notation in architecture, will have effects on the conventions of the profession. The method of inquiry depends on discourse analyses and simple analytical observations. Discourse analysis is based on French philosopher Jean-François Lyotard’s rhetoric on the correlation between the form of knowledge and social structures. Lyotard shows the effect of common form of knowledge and legitimization mechanisms on society. According to Lyotard, knowledge, which can be either in narrative or scientific form, must be legitimate in order to have a social acceptance whether it is in narrative or scientific form. Thus, each form has different self-legitimizing mechanisms. Today, however, knowledge acquires a new form: information. This revealing form of knowledge does not require to be legitimate to achieve a social acceptance. In the field of architecture, BIM is the informational form of the transmission of architectural knowledge. Findings: This form of informatic notation in architecture differs from previous notation modes. The dominant notation of architectural design in the scientific modern period had been drawings. Computer aided design (CAD) tools which were used in the early years of the digital age, could not remove the representational notation of drawings. BIM, however, is instead a simulative expression than a representation, because of its logic and organization. A representation always is a partial expression of a reality and has a level of ambiguity. For this reason, the representation has been the realm of meaning creation for modern architectural practice which built upon representational notation. On the other hand, representational notation is responsible for the separation between architect and the field of construction. Simulative notation unlike representational notation, demands to be accepted as the reality itself although it is a diminished version of it. Therefore, it does not entail the creation of new meanings, but offers different opportunities, such as precision and testing. Digital information modelling as architectural expression based on a relational database, is a simulation as far as it goes beyond representation. It is a digital twin of a future building, and a relational associative parametric model of the design itself, not an expression of the representation of design. In this respect, it creates a new digital tectonic and digital architectural information flow. As a result, YEM is a simulative architectural notation which implements predominantly digital tectonics over architectural design process.
Keywords: Building Information Modelling, Representation, Simulation, Notation, Meaning, Tectonics