consultation with the organisations of employers and workers concrned, where such exist, may be exempted from the application of ihis Convention.

5. The competent authority may, after consultation with the organisations of employers and workers concerned, where such exist, exclude from the application of this Convention persons occupying positions of management or of a technical, professional or scientific character, whose conditions of employment are not regulated by national laws or regulations, collective agreement or arbitration award and who do not ordinarily perform manual work.

Article 2

1. Contracts to which this Convention applies shall include clauses ensuring to the workers concerned wages (including allowances), hours of work and other conditions of labour which are not less favourable than those established for work of the same character in the trade or industry concerned in the district where the work is carried on—

(a) by collective agreement or other recognised machinery of negotiation between organisations of employers and workers representative respectively of substantial proportions of the employers and workers in the trade or industry concerned; or

(b) by arbitration award; or

(c) by national laws or regulations.

2. Where the conditions of labour referred to in the preceding paragraph are not regulated in a manner referred to therein in the district where the work is carried on, the clauses to be included in contracts shall ensure to the workers concerned wages (including allowances), hours of work and o*her conditions of labour which are not less favourable than—

(a) those established by collective agreement or other recognised machinery of negotiation, by arbitration, or by national laws or regulations, for work of the same character in the trade or industry concerned in the nearest appropriate district; or

(b) the general level observed in the trade or industry in which the contractor is engaged by employers whose general circumstances are similar.

3. The terms of the clauses to be included in contracts and any variations thereof shall be determined by the competent authority, in the manner considered most appropriate to the national conditions, after consultation with the organisations of employers and workers concerned, where such exist.