Artikel 4

1. Where necessary, appropriate arrangements shall be made to define the line which separates the establishments to which this Convention applies from other establishments.
2. In any case in which it is doubtful whether an establishment, institution or administrative service is one to which this Convention applies, the question shall be settled either by the competent authority after consultation with the representative organisations of employers and workers concerned, where such exist, or in any other manner which is consistent with national law and practice.