In a first aspect, the invention relates to a method for designing a personalized shell seat for a subject, the method comprising obtaining a two-dimensional sagittal profile of the seating surface of a seating device, in which the shape of the seating surface is adapted to the posture and/or body contours of a subject sitting onto the seating device, and the computer-controlled design of a three-dimensional shell seat model, at least based on said obtained two-dimensional profile. In a second aspect, the invention relates a computer-controlled program for designing a personalised shell seat for a subject, for supporting the method and in a third aspect, the invention relates to a personalised shell seat for a subject that is designed using the method.
