The main objective of the paper is to suggest proposals likely to facilitate the relationship between the Client and the Contractor/Subcontractors, in order to improve the management of the construction phases with regard to Health & Safety (H&S). It is based on field research in the context of Italian construction. The paper analyzes and compares the content of two documents: The Safety and Coordination Plan (SCP) and the Safety Operational Plan (SOP), with the intent of implementing them in an integrated system managing H&S on construction sites. The comparative analysis recommends several improvements and the optimization of relationships between Client and Contractor, fostering a climate of cooperation and an optimum management of H&S within the construction site.