Article 15

(a) prescribed classes of employees, constituting not less than 50 per cent of all employees; or

(b) prescribed classes of the economically active population, constituting not less than 20 per cent, of all residents; or

(c) all residents whose means during the contingency do not exceed limits prescribed in such a manner as to comply with the requirements of Article 67; or

(d) where a declaration made in virtue of Article 3 is in force, prescribe classes of employees, constituting not less than 50 per cent, of a employees in industrial workplaces employing 20 persons or more.