11.5. The arbitrator shall determine which decree is applicable to the employees concerned.
In rendering his award, the arbitrator may, subject to the third paragraph, have regard to the agreements made and the awards rendered in similar circumstances.
In an instance of double coverage, the arbitrator must render his award on the basis of the main activity of the enterprise of the professional employer in the 12-month period preceding the application for arbitration. To determine the main activity, he may consider the total number of employees and the volume of products, services and business in each field of activity.