The bargaining model (partsmodellen) the parties settle it, not the central government
What The basic idea that the union and the employer settle pay and conditions themselves, while the central government stays out of it.
Who The labour market parties, that is, unions and employers outside the public sector, which together carry responsibility for the rules of the game.
How You meet the model through the collective agreements at your workplace, and you can influence it through membership in a union or an employers' organisation.