who helps the minister to form a decision
Minister (government) A minister is a politician who holds public office in a national or regional government, making and implementing decisions on policies in conjunction with the other ministers. In some jurisdictions the head of government is also a minister and is designated the "prime minister", "premier", "chief minister", "Chancellor" or other title.
Prime minister The prime minister is often, but not always, a member of the Legislature or the Lower House thereof and is expected with other ministers to ensure the passage of bills through the legislature. In some monarchies the monarch may also exercise executive powers (known as the royal prerogative) that are constitutionally vested in the crown and may be exercised without the approval of parliament.