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From: http://www.premiers.qld.gov.au/publications/categories/policies-and-codes/handbooks/cabinet-handbook/process/collective-resp.aspx

Cabinet is responsible for the performance of the government. Each Minister acts jointly with and on behalf of Cabinet colleagues in their capacity as Ministers. Not only does this ensure collective responsibility, but it also enhances collective adherence to all decisions made in Cabinet. Cabinet decisions reflect collective conclusions and are binding on all Ministers as government policy. If a Minister is unable to publicly support a Cabinet decision, the proper course is to resign from Cabinet. All Ministers are required to give their support in public debate to collective decisions of the Cabinet and the government.