1. The beginning of organization development was in the forties, when Kurt Lewin
realized with his T-group experiments that “a special learning opportunity resides
in, if a group puts itself into the center of the learning” (Gyulai, 1994). The first
executed T-group in a small group training with behavioural scientists and
researchers’ participation was in Bethel in 1947 where they could get experiences
about the feedback of the collective interactions. This behavioural based training
supported the basis model of the so-called experiental learning (learning by
experiences) (Lövey, 1989).