Cheutet, V.Catalano, C. E.Pernot, J. P.Falcidieno, B.Giannini, F.Leon, C.Joaquim Armando Pires Jorge and Eric Galin and John F. Hughes2014-01-272014-01-2720043-905673-16-91812-3503https://doi.org/10.2312/SBM/SBM04/009-018This paper addresses the designers activity and in particular the way designers express an object shape in 2D sketches through character lines. The tools currently available in commercial CAS/CAD systems to manipulate the digital models are still not sufficiently suited to support design. In this paper, we introduce the so-called Fully Free Form Deformation Features (d-F4), able to take into account the curve-oriented stylists way of working. Both the advantages of a free form surfaces deformation method and a feature-based approach are merged to define highlevel modelling entities allowing for a direct manipulation of surfaces through a restricted number of intuitive parameters. In addition, a d-F4 classification is proposed to permit a fast access to the desired shape according to its semantics. The proposed approach is illustrated with some examples.