The current coalition includes the UUP, the Democratic Unionist Party, Sinn Féin, the SDLP and Alliance.
The Ulster Unionist Party leader claims the system of a mandatory five-party coalition at Stormont no longer delivers good government, and must be changed.
Doug Beattie told his party's annual conference that Stormont has become dysfunctional, and people are angry.
He called for a "working power-sharing government" where the electorate can vote out those not up to the role.
The current coalition includes the UUP, the Democratic Unionist Party, Sinn Féin, the SDLP and Alliance.