The heads of external companies must inform the user company in writing of:
1° The date of their arrival and the foreseeable duration of their work;
2° The foreseeable number of workers assigned;
3° The name and qualifications of the person in charge of managing the work;
4° The names and references of their subcontractors, as soon as possible and in any event before the start of the work assigned to them;
5° Identification of the subcontracted work.