Answer:Negotiation
Explanation:Negotiation refers to working with the other party in order to settle your differences .
This is when people from both sides make compromises so that they can meet each other half way and have an agreement which will prevent having a conflict. This aims at achieving a best outcome for both parties or all the parties involved.
A union is mostly representing workers so to make changes that won't upset workers ,it would benefits both sides to agree on one thing on how to implement these changes.
