Here we look at how democracies are built: the different ways they organize the relationship between voters, legislatures and executives. These design choices affect how governments are formed, how stable they are and how easily they can be held to account.

Direct and representative

In direct democracy, citizens vote on laws themselves, as adult male citizens did in the assembly of ancient Athens. Few modern states use pure direct democracy, but many use elements of it. Switzerland holds national referendums several times a year, and citizens can force a vote on a law or propose constitutional amendments by gathering signatures. Two small Swiss cantons still hold an open-air assembly, the Landsgemeinde, where citizens vote by raising their hands. New England towns in the United States hold town meetings. Many US states, such as California, allow citizens' initiatives.

Most democracies are representative: citizens elect representatives to make laws and run the government. Within representative democracy, the biggest design choice concerns the executive.

Presidential systems

In a presidential system, such as the United States, most of Latin America and the Philippines, the president is elected separately from the legislature and serves a fixed term. The president is both head of state and head of government, appoints the cabinet, and cannot be removed by the legislature simply for losing its support, only through an extraordinary process such as impeachment for serious wrongdoing. The legislature, in turn, cannot be dissolved by the president. Power is deliberately separated, with each branch checking the others.

Supporters argue that this gives voters a direct choice of leader, clear accountability, and stability of fixed terms, while the separation of powers prevents concentration of power. Critics point to the risk of gridlock when president and legislature are controlled by different parties. In an influential 1990 essay, “The Perils of Presidentialism,” the political scientist Juan Linz argued that presidential systems are more prone to breakdown, because both president and legislature can claim a popular mandate, fixed terms make it hard to resolve crises, and winner-take-all elections raise the stakes. He noted that the United States was unusual among long-lasting presidential democracies. Other scholars have disputed his conclusions, arguing that the problems he identified depended on other factors, such as party systems and economic conditions.

Parliamentary systems

In a parliamentary system, such as the United Kingdom, Canada, Germany, India and Japan, voters elect a legislature, and the government is formed from it. The head of government, usually called the prime minister, is typically the leader of the party or coalition that commands a majority in parliament, and remains in office only as long as parliament supports the government. If parliament passes a vote of no confidence, the government must resign or call new elections. The head of state, a monarch or a largely ceremonial president, is separate.

The British version, often called the Westminster model, usually produces single-party governments with strong control over parliament. In countries using proportional representation, coalitions of several parties are common.

Germany added a refinement. To avoid the instability of the Weimar Republic, its 1949 Basic Law created the constructive vote of no confidence: parliament can remove the chancellor only by simultaneously electing a successor. It has succeeded only once, in 1982, when Helmut Kohl replaced Helmut Schmidt.

Supporters argue that parliamentary systems are flexible, since an unpopular or failing government can be replaced without waiting for a fixed term, and that they encourage cooperation. Critics note that they can produce unstable coalitions, as in Italy, which has had dozens of governments since 1946, or concentrate power in a prime minister with a large majority.

Semi-presidential systems

Some countries combine both. In a semi-presidential system, such as France under the Fifth Republic, created in 1958, there is both a directly elected president with significant powers and a prime minister accountable to parliament. When the president and the parliamentary majority come from opposing parties, the result is called cohabitation; France experienced it three times between 1986 and 2002, with power shifting toward the prime minister on domestic affairs. Variants exist in Portugal, Poland, Ukraine and elsewhere.

A council instead of a president

Switzerland has a rare model: its executive is the Federal Council, seven members elected by parliament, drawn from the main parties, who govern collectively. The presidency rotates among them each year and is largely ceremonial.

Worked example: a budget crisis in two systems

Imagine the government's budget is rejected by the legislature. Compare what happens.

• Presidential system. The president stays in office. The two branches must negotiate. If they cannot agree, government services may shut down temporarily, as has happened in the United States. The deadlock can last until the next election.
• Parliamentary system. Losing a vote on the budget is usually treated as a loss of confidence. The government resigns, a new coalition forms, or new elections are called within weeks. The crisis ends quickly, but the country may face repeated elections.

Neither system is clearly better in all circumstances. Each trades off stability against flexibility, and clear accountability against cooperation. Good outcomes depend not only on the formal design but on parties, courts, a free press and politicians willing to respect the rules when they lose.