Publicly-funded education in Ontario uses a two-tier bargaining process:
Central Bargaining which takes place between the Government of Ontario, union groups (central team) and the Trustees Associations. Central bargaining would include province-wide issues e.g., compensation, class sizes.
Local Bargaining which takes place between the union groups (local team) and the District School Board. Local bargaining would include issues specific to each Board of Education e.g., management rights, contracting out.
This means that the central body of each union negotiates with the province AND their local units bargain with each individual school board. Different aspects of a collective agreement are negotiated at each level.