G.4.4.2  The training program for DCOs  shall include, as a minimum:  a) Comprehensive theoretical training in those Doping Control  activities relevant to the DCO  position;  b) Observation of all Sample Collection Session activities that are the responsibility of the DCO  as set out in this International Standard for Testing and Investigations, preferably on -site; and  c) The satisfactory performance of one complete Sample Collection Session on-site under observation by a qualified DCO  or similar.