There are a number of differences between the national parliaments of member states, owing to the various historical development of each country. 15 states have unicameral parliaments, with the remainders choosing
bicameral systems. Unicameral or lower houses are always
directly elected, whereas an upper house may be directly elected (e.g. the
Senate of Poland); or
indirectly elected, for example, by regional legislatures (e.g. the
Federal Council of Austria); or non-elected, but representing certain
interest groups (e.g. the
National Council of Slovenia). Furthermore, most states are
Parliamentary democracies, hence the
executive is drawn from the Parliament. However, in some cases a more
presidential system is followed and hence there are separate elections for the
head of government and the Parliament, leading to greater discontinuity, yet more independence, between the two
branches of government. However, only Cyprus follows a fully presidential system, with France following a
semi-presidential system. ==Overview==