All negotiations which take place between an employer, a group of employers or one or more employers' organisations, on the one hand, and one or more trade unions or, in their absence, the representatives of the workers duly elected and authorised by them in accordance with national laws and regulations, on the other, for: (i) determining working conditions and terms of employment; and/or (ii) regulating relations between employers and workers; and/or regulating relations between employers or their organisations and a workers' organisation or workers' organisations.