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Aim of the paper is to present a theoretical-methodological reflection on HBIM, pointed to propose a workflow. The BIM procedure deals with new buildings design, construction, and management, and it plays an increasingly important role in the AEC field. Consequently, national and international studies and standards grow: the English PAS 1192-2 of 2013, the American BIM Forum, the European 2014/24/EU, the Italian “Decreto BIM” 1/12/2017 n. 560, the UNI 11337:2017. However, the HBIM procedure is different from the BIM one, because the HBIM roots on a surveying inductive synthesis process, where the real elements and data have to be critically understood, semantized and modelled, and composed to synthesize the whole restitutive HBIM system. Therefore, the following issues become pivotal: how to define and apply the Levels of Development (loD), Levels of Geometry (LoG), and Levels of Information (LoI); how to describe and evaluate Transparency and Reliability; how to expand the database; how to use BIM commercial software that does not fully supports HBIM. For example, the HBIM model usually does not present a uniform LoD(s) – in particular LOI(s) – (but spotty ones) because it rises from a punctual knowledge. Moreover, the historical-critical information often does not relate to the digital representation of physical and functional characteristics of a single object. Finally, yet importantly, there is the problem of the definition of the LoG of HBIM objects – derived from point clouds –, in accordance to the specific modeling aims: in fact, in order to obtain a higher LoG, a different modeling procedure can be chosen, for example for comple geometrical shapes it can be used Nurbs modeling.

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