In a parliamentary system, the government needs the support of more than half the members of the lower house.
When no one wins outright
If no single party has a majority, two or more parties can agree to support one government together.
Writing down the deal
Partners often agree a shared programme listing the policies they will pursue, and how ministries will be shared.
Proving support
The new government may have to win a confidence vote on the floor of the house to show it really has a majority.
Why coalitions can wobble
If a partner withdraws support, the government can lose its majority and face another confidence vote.
Series · Part 4 of 4How Power Works
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