The present invention provides a methodology for assisting a user in the combination of objects (e.g. functional blocks) through an intuitive user interface which, according to a preferred embodiment, is construed to simulate the effect of magnets: a high affinity degree between two blocks is represented in a magnetic-like style as a simulated attraction giving a feedback to the user. Such attraction feedback can be represented in several different ways, from a simple visual representation to a proper mechanical feedback conveyed to the user through the input device used for making the block selection (e.g. a mouse, a track point or a joystick).