The universal use of elections as a tool for selecting representatives in modern democracies is in contrast with the practice in the democratic archetype, ancient Athens. Elections were considered an oligarchic institution and most political offices were filled using sortition, also known as allotment, by which officeholders were chosen by lot.

Electoral reform describes the process of introducing fair electoral systems where they are not in place, or improving the fairness or effectiveness of existing systems. Psephology is the study of results and other statistics relating to elections (especially with a view to predicting future results).

Ideology

Characteristics of elections

The question of who may vote is a central issue in elections. The electorate does not generally include the entire population; for example, many countries prohibit those judged mentally incompetent from voting, and all jurisdictions require a minimum age for voting.

Historically, other groups of people have also been excluded from voting. For instance, the democracy of ancient Athens did not allow women, foreigners, or slaves to vote, and the original United States Constitution left the topic of suffrage to the states; usually only white male property owners were able to vote. Much of the history of elections involves the effort to promote suffrage for excluded groups. The women's suffrage movement gave women in many countries the right to vote, and securing the right to vote freely was a major goal of the American civil rights movement. Extending the right to vote to other groups which remain excluded in some places (such as convicted felons, members of certain minorities, and the economically disadvantaged) continues to be a significant goal of voting rights advocates.

Suffrage is typically only for citizens of the country. Further limits may be imposed: for example, in Kuwait, only people who have been citizens since 1920 or their descendants are allowed to vote, a condition that the majority of residents do not fulfill. However, in the European Union, one can vote in municipal elections if one lives in the municipality and is an EU citizen; the nationality of the country of residence is not required.

Nomination

A representative democracy requires a procedure to govern nomination for political office. In many cases, nomination for office is mediated through preselection processes in organised political parties.

Non-partisan systems tend to differ from partisan systems as concerns nominations. In a direct democracy, one type of non-partisan democracy, any eligible person can be nominated. In some non-partisan representative systems no nominations (or campaigning, electioneering, etc.) take place at all, with voters free to choose any person at the time of voting—with some possible exceptions such as through a minimum age requirement—in the jurisdiction. In such cases, it is not required (or even possible) that the members of the electorate be familiar with all of the eligible persons, though such systems may involve indirect elections at larger geographic levels to ensure that some first-hand familiarity among potential electees can exist at these levels (i.e., among the elected delegates).