“…Mathematical models of knowledge diffusion were applied to several contexts, i.e., diffusion of correct life styles (Rogers 1995), nursing training (Pediani and Walsh 2000), choice of sexual partners (Lalana 1994), diffusion of drug addiction (Ferrence 2000), marketing (Milling 1996), development of psychosomatic diseases (Ross 1999), imitative learning (Higgs 2000), nursing (Wallingford et al 1996), diffusion of the results of nursing practice (Dooks 2001), prevention of diseases (Green and Johnson 1996), adoption of new pharmacological treatments in the clinical practice (Steffensen et al 2001), promotion of health (Ferrence 2001), and so on. According to this point of view, the institutions, such as schools and universities, can be conceived as particular networks of 446 U. GIANI ET AL.…”