The core business of trade unions is to bargain for better wages and working conditions for their members. This is what the National Union of Metalworkers of South Africa (Numsa) set out to achieve at its national bargaining conference (NBC) in Pretoria from 16 to 19 April 2013. Elijah Chiwota looks at what underpins collective bargaining at one of the Congress of South African Trade Union’s (Cosatu) biggest affiliates.