The carried out work have permitted to make a technical evaluation of the risk robbery in a big Company of services and to formulate a strategy in order to prevent the criminal event and its effects on the workers' health. At this point an algorithm of prevision of risk has been formulated, taking account the elements of probability of criminal act and those ones referring to the relating damage according to the following formula: RISK(R) = PROBABILITY(P) x DAMAGE(D). The use of this method has proved useful to obtain the right evaluation risk robbery and it has permitted to elaborate a document of Health Protection to use towards the workers who are involved in the event with the active participation of the Company doctor.