During the Bid Phase if requested by BT, the Supplier shall perform and provide a Preliminary Hazard Analysis if requested by BT.Preliminary Hazards Analysis (PHA) shall be in line with the template provided by BT (PRD Appendix_Product Safety _B_PHA).This analysis consists in:1) Identifying and evaluating the hazards based on the required qualitative risk evaluation concept. Subsystem-related hazards shall be derived to by the Supplier, from the generic list of hazards identified for railway systems given in the ""PRD Appendix_Product Safety_A_Hazard List"" of this PRD as a starting point.2) Identifying the need of hazard mitigation/control measures for and in his scope of supply, based on the initial risk classification, the Supplier shall manage the risk reduction at an acceptable level through the definition of the main mitigation measures available on the offered subsystem."