The purpose of the preliminary design studies is to :
1° Specify the general composition in terms of plan and volume;
2° Assess the internal volumes and external appearance of the structure;
3° Propose possible technical arrangements and, where appropriate, recommend additional studies of existing structures, particularly in the context of reuse and rehabilitation operations;
4° Participate in checking the timetable for completion and, where appropriate, the division into functional phases;
5° Participate in checking that the architectural, technical and economic elements are consistent with the general economics of the overall contract.