If the work is carried out within a construction site, the situation becomes complicated because there are other obligations defined by Title IV of Legislative Decree 81/08.Each construction site has a safety coordinator in the planning and execution phase (CSP and CSE – Italian acronyms) who elaborates a document called Coordination Safety Plan (Italian acronym PSC).Therefore, every company, to enter in a construction site, must write its own Operational Safety Plan (POS acronym in Italian).Finally, there are procedures established by law for subcontracting and to verify the technical and professional suitability of subcontractors.