Aquarium -

one of the techniques of training, involving the participation of two kinds: active and passive. Participants taking active part, do exercise, play roles such as vendor and th e customer, and the other (passive) observe its course [1]. Passi ve participants generally much less emotionally involved in an exercise than participants factors. Observing the exercise external see more than a practitioner. Therefore, the observations made are often a source of valuable feedback information for practitioners.