Article R2431-10 of the French Public procurement code
The purpose of the preliminary design studies is:1° To specify the general composition in terms of plan and volume;2° To assess the internal volumes and external appearance of the structure;3° To propose the technical arrangements that may be envisaged;4° To specify the timetable for completion and, where appropriate, the division into functional phases;5° To draw up a provisional estimate of the estimated cost of the works.