Differences with a parliamentary system

A number of key theoretical differences exist between a presidential and a parliamentary system:

• In a presidential system, the central principle is that the legislative and executive branches of government should be separate. This leads to the separate election by the electorate or an electoral college of the president, who is elected to office for a fixed term of office, and only removable in extreme cases for gross misdeamour by impeachment and dismissal. In addition he or she does not need to choose cabinet members from or commanding the support of, a legislative majority. By contrast, in parliamentary systems, government is usually carried out by a cabinet headed by a Prime Minister who in many instances are members of parliament (legislature), are directly accountable to parliament and may by parliamentary vote be dismissed.

• As with the President's set term of office, the legislature also exists for a set term of office and cannot be dissolved ahead

The leader of the executive Cabinet, the Prime Minister, is usually the head of government - at least in practice. In most parliamentary systems the Prime Minister and the members of Cabinet are also members of the legislature. The leader of the leading party in the Parliament is often appointed to Prime Minister.

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