These details would be determined in advance as part of the coalitionnegotiations.
Times, Sunday Times (2010)
After weeks of failed coalitionnegotiations, a second election was called.
Times, Sunday Times (2016)
Coalitionnegotiations will now take place.
Times, Sunday Times (2013)
Definition of 'negotiation'
negotiation
(nɪgoʊʃieɪʃən)Explore 'negotiation' in the dictionary
variable noun
Negotiations are formal discussions between people who have different aims or intentions, especially in business or politics, during which they try to reach an agreement.