Failure to reform Stormont power-sharing is "condemning devolution to death by a thousand collapses", Alliance Party leader Naomi Long has said.
In her speech at the party's annual conference, Mrs Long said the current system of "stop-go, up-down, ransom politics needs to end".
She warned her party is willing to test the legality of Stormont voting structures which leave those who do not designate as nationalist or unionist locked out of key decisions.