Methods

• Less effective

are forced solving or withdrawed solving - (command based) negotiating doesnt solves any conflict, it hardens the confrontation

• Collaboration

can be effective when theres no one forced or withdrawed

• Smoothing

is not clearly less or more effective, played down differences can block solution finding for a temporary ease of the situation. on the other side it can be used to connect with the conflict counterpart emotionally. 

if one makes sure to trigger only positive emotions, it can possibly lead to a compromise.

1. Try to use positive words, every word will have a little emotional impact that influences how competent you seem.
2. Replace forcing elements with less agressive ones. "We must" - "We should"
3. Show your counterpart that you understood his feelings and offer discussion on that par...