The deliberations by which departmental councils create an interdepartmental institution set out:
1° The purpose, headquarters and duration of the public establishment;
2° The rules for distributing the expenditure of the establishment between the departments concerned;
3° The composition of the board of directors, the term of office of its members and the rules for their renewal.
The establishment is created on the date set by the concordant deliberations of the departmental councils. Where these deliberations do not provide otherwise, the establishment is created as soon as the last of the deliberations relating to the creation of the establishment has become enforceable.