Abstract: The method according to the invention concerns a process of assistance with the fitting out of a space, where this method implements a management and assistance unit (U) in connection with a variety of suppliers, and to which a user/customer (Blocks C11-Cln), equipped with a local unit (Blocks UL1-ULn), is able to connect, where the said method comprises the following stages: 2D or 3D modelling by the unit (U) of the fitting-out elements (Blocks BD1-BDn) of the said suppliers (Blocks F1-Fn) in accordance with a predetermined standard, incorporation by the said unit (U) of the modelled elements into a database (Block 1) which can be accessed by the users, making available to the user/customer by the unit (U) of a 2D or 3D modelling application, modelling by the user/customer on his local unit (Blocks UL1-ULn) of a space using the said application in accordance with the standards of the application, selection by this user/customer on his local unit of modelled elements in the said database, positioning by the u