What Is Sortition? How Selection by Lot Works in Democracy

Sortition is the practice of filling political or civic roles by random selection rather than by election or appointment. The idea sounds radical to modern ears, but it was the backbone of Athenian democracy for roughly two centuries, and it has made a striking comeback in recent decades through citizens’ assemblies, climate panels, and constitutional conventions around the world. What makes sortition interesting today is not just the principle behind it but the accumulating real-world evidence about what happens when ordinary people, chosen at random, are asked to tackle some of the hardest policy questions a society faces.

Roots in Ancient Athens

Sortition’s oldest and best-known precedent is classical Athens, where most civic offices were filled by lot from among eligible citizens. The Council of Five Hundred, which set the agenda for the assembly, was selected this way. So were jurors, magistrates, and members of oversight bodies. The Athenians considered election to be an oligarchic method, one that favored the wealthy and well-connected, while lottery was seen as the genuinely democratic tool because it gave every eligible citizen an equal chance at governance.

The practice was not unique to Athens. Various Italian city-states, including Florence and Venice, used forms of lottery for selecting officeholders during the medieval and Renaissance periods. Venice famously combined multiple rounds of lottery and voting in an elaborate procedure for choosing its Doge, designed to prevent any single faction from controlling the outcome. These historical uses shared a common logic: randomness as a check on corruption and concentrated power.

How Modern Sortition Works

Contemporary sortition does not typically mean randomly picking someone and handing them a legislative seat. Instead, it usually takes the form of a citizens’ assembly or deliberative mini-public. Invitations go out to a large, randomly selected pool of residents. From those who agree to participate, organizers use stratified sampling to assemble a group that mirrors the broader population on key characteristics like age, gender, geography, and sometimes education or income level.

Once assembled, participants receive briefings from experts on various sides of an issue, engage in facilitated small-group discussions, and eventually produce recommendations. The whole process typically spans weeks or months, with participants compensated for their time. The idea is to combine the representative quality of randomness with the informed judgment that comes from genuine deliberation.

One persistent challenge in this process is self-selection bias. Even when invitations go out at random, not everyone says yes, and different demographic groups accept at different rates. Researchers have developed algorithms to counteract this problem, restoring close-to-equal representation probabilities for all participants while still meeting demographic quotas. These algorithms require estimating how likely each person in the volunteer pool was to participate in the first place, which can be inferred from survey data about the general population.

1arXiv. Neutralizing Self-Selection Bias in Sampling for Sortition

Ireland’s Citizens’ Assembly and the Abortion Referendum

The most frequently cited modern success story for sortition is Ireland. In 2016, the Irish government established a Citizens’ Assembly of 99 randomly selected citizens to deliberate on several constitutional questions, including the country’s near-total ban on abortion. After months of expert testimony, personal accounts, and structured discussion, the assembly recommended liberalizing access, specifically endorsing abortion on request within the first twelve weeks of pregnancy.

That recommendation shaped what followed. The assembly helped generate both political and public support for a specific form of liberalization. It gave legislators cover to pursue reform they might otherwise have avoided due to the political risks of the issue. And it provided information about what kind of proposal could realistically win a referendum. In May 2018, Irish voters repealed the Eighth Amendment by a two-to-one margin.

2International Journal of Constitutional Law. Constitutional amendment and public will formation: Deliberative mini-publics as a tool for consensus democracy

Ireland’s experience showed that sortition-based bodies can move the needle on issues where elected politicians are deadlocked or fearful. The assembly did not have binding power, but its legitimacy as a cross-section of the public made it politically difficult to ignore.

Belgium’s Permanent Model

Most citizens’ assemblies are one-off events, convened for a specific question and then dissolved. The German-speaking Community of Belgium broke with that pattern in 2019 by establishing a permanent deliberative system directly linked to its parliament. A standing Citizens’ Council, whose members are drawn by lot, decides which policy topics deserve deeper examination. When it identifies a topic, a separate Citizens’ Assembly, also drawn by lot, convenes to deliberate and formulate recommendations on that specific issue. Those recommendations then feed into the parliamentary process.

3Parliamentary Affairs. Institutionalising Citizen Deliberation in Parliament: The Permanent Citizens’ Dialogue in the German-speaking Community of Belgium

This model is significant because it addresses one of the main criticisms of citizens’ assemblies: that they are ad hoc, with no guaranteed influence on actual legislation. By embedding sortition into the permanent institutional architecture of government, Belgium created a structure where randomly selected citizens have an ongoing role rather than a one-time advisory function. The experiment is still relatively young, but it has attracted attention from democratic reformers worldwide as a template for what institutionalized sortition might look like.

Do Participants Actually Change Their Minds?

A common skepticism about deliberative assemblies is that people show up with fixed opinions and leave unchanged, making the whole exercise theater. The evidence suggests otherwise, though the picture is more nuanced than enthusiasts sometimes claim.

Research on the Irish Citizens’ Assembly found that participants did shift their views, but not uniformly. Citizens most likely to change their opinions after deliberation tended to be under 65 and had moderate (not the highest) levels of prior knowledge about the topic. The composition of discussion groups also mattered: groups that were more diverse in viewpoint were more effective at producing genuine shifts in opinion than homogeneous ones.

4International Political Science Review. When do deliberative citizens change their opinions? Evidence from the Irish Citizens’ Assembly

Similar patterns have emerged in other contexts. A study of citizens’ assemblies focused on sustainability in rural East German municipalities found that participation increased people’s knowledge about the issues and made them perceive change as more feasible, which in turn affected their willingness to change their behavior.

5Environmental Policy and Governance. “We Are Willing to Change, If…”: Potential Impacts of Citizens’ Assemblies on the Willingness to Change for Sustainability in Rural East German Municipalities

The takeaway is that deliberation does not magically produce consensus, but it reliably increases knowledge and shifts at least some participants’ positions. The effect is strongest when groups are diverse and when participants enter without strong prior commitments on the topic. People who already have deep knowledge or firm ideological stakes are harder to move, which is not surprising but is worth keeping in mind when evaluating what assemblies can realistically accomplish.

Sortition and Climate Policy

Citizens’ assemblies have become particularly popular for climate-related questions. France convened a 150-member Climate Convention in 2019-2020. The UK held a Climate Assembly in 2020. Similar exercises have taken place in Germany, Denmark, Scotland, and elsewhere. The appeal is obvious: climate policy involves long time horizons, complex trade-offs, and the kind of short-term costs that elected politicians are reluctant to impose on voters. A randomly selected body, freed from electoral pressures, can in theory approach these trade-offs more honestly.

The results have been mixed in terms of policy impact. A comparative study of six climate assemblies found that their influence on governance depends heavily on how they are integrated into existing political and policy institutions. The internal design of the assembly matters, but so does the surrounding context: whether politicians commit in advance to acting on recommendations, whether there are clear channels for transmitting findings into legislation, and whether the assembly’s mandate is narrow enough to produce actionable proposals rather than vague aspirations. Treating assemblies as a standardized tool with predictable effects misses how much variation exists in their actual influence.

6Public Administration. Integrating citizen deliberation into climate governance: Lessons on robust design from six climate assemblies

France’s Climate Convention illustrates the frustration that can follow even a well-run process. The convention produced 149 proposals, President Macron initially promised to implement them “without filter,” and then the government quietly watered down or dropped many of them. For advocates, this was a betrayal. For critics, it showed that assemblies without binding authority are ultimately at the mercy of the same political dynamics they were meant to bypass.

Can Sortition Scale Globally?

In 2021, a Global Assembly brought together 100 participants from around the world to deliberate on climate change ahead of COP26 in Glasgow. The experiment raised a question that keeps getting bigger: can sortition work at the international level?

An analysis of the Global Assembly’s influence found that designing an effective global-scale climate assembly involves far more than scaling up the logistics of a national-level process across greater geographic, cultural, and linguistic dimensions. It requires a deep understanding of how influence operates within the complex system of global climate governance, including how any future assembly would couple with existing institutions like the UNFCCC and how it could achieve systemic influence rather than simply producing a set of recommendations that no specific body is obligated to consider.

7Environmental Science & Policy. Analysing the Global Assembly’s influence: The challenges of linking to the deliberative system of global climate governance

At the national level, a citizens’ assembly can point to a clear government that has the power to act on its recommendations. At the global level, there is no such authority. The challenge is not just translation and logistics, though those are real enough when you are trying to facilitate meaningful discussion among people from dozens of countries. The deeper problem is that global governance is a patchwork of treaties, institutions, and sovereign states, and a randomly selected body has no obvious place to plug in.

The Representation Problem

One of sortition’s central promises is descriptive representation: a randomly selected body should, in theory, look like the population it is drawn from. In practice, this promise runs into several obstacles beyond the self-selection bias already discussed.

Some proposals have suggested using sortition within political parties, randomly selecting candidates from among party members rather than holding traditional primaries or selection processes. Research examining this idea for the UK Parliament found that the results would be mixed at best. Because party memberships themselves are unrepresentative of the general population, running a lottery among party members produces a body that still does not mirror society as a whole. Random selection can only be as representative as the pool it draws from.

8Party Politics. Different baselines, different outcomes: Reassessing the representative promise of within-party sortition

This is a broader lesson: sortition works best when the invitation pool is genuinely the entire eligible population, not a self-selected subset. Drawing from voter rolls excludes people who are not registered. Drawing from census data is more inclusive but still misses undocumented residents and others who fall through administrative cracks. Every choice about who gets invited shapes who can be selected, and those choices are not politically neutral even when the selection mechanism itself is random.

What Sortition Cannot Do

Enthusiasm for sortition sometimes outpaces what the evidence supports. A few limitations are worth being clear about.

First, randomly selected citizens are not accountable in the way elected representatives are. If an elected official makes a bad decision, voters can remove them. A citizen on a sortition panel serves their term and goes home. Some democratic theorists see this as a feature, not a bug, since it frees panelists from the distortions of electoral incentives. Others see it as a fundamental problem: governance without accountability is governance without a feedback loop.

Second, the quality of a citizens’ assembly depends enormously on its design. Who chooses the expert witnesses? How are discussion questions framed? What facilitation methods are used? These are all choices made by organizers, not by the randomly selected participants, and they shape outcomes in ways that are not always transparent. A poorly designed assembly can be steered toward a predetermined conclusion just as easily as a well-designed one can produce genuine deliberation.

Third, sortition does not eliminate power dynamics within the room. Research consistently finds that education, confidence, and social status affect who speaks and who is heard in group discussions. Good facilitation can mitigate this, but it cannot erase it entirely. The person who speaks most fluently or with the most authority often has outsized influence on group recommendations, regardless of whether they were selected by lottery or by election.

Sortition and Electoral Democracy

Sortition is sometimes presented as a replacement for electoral democracy, but almost no one with practical experience running citizens’ assemblies frames it that way. The realistic version is complementary: sortition-based bodies operating alongside elected legislatures, handling specific questions where electoral politics creates perverse incentives. Constitutional reform, long-term infrastructure planning, and issues involving deep value conflicts are the kinds of questions where citizens’ assemblies have shown the most promise.

The Irish case is instructive here. The Citizens’ Assembly did not replace the Oireachtas (Ireland’s parliament). It produced recommendations that parliament then debated, refined, and put to a public referendum. The assembly created political space for action, but the traditional democratic institutions retained decision-making power. That hybrid model, where sortition informs and elected bodies decide, is the version most likely to spread in coming years.

9International Journal of Constitutional Law. Constitutional amendment and public will formation: Deliberative mini-publics as a tool for consensus democracy

Belgium’s permanent model pushes further, giving randomly selected citizens an ongoing institutional role rather than a one-time advisory one. But even there, the parliament retains final authority. The innovation is structural, embedding sortition into the machinery of government, rather than revolutionary in the sense of replacing elections altogether.

Who Is Pushing for Sortition Today

The contemporary sortition movement draws from a surprisingly wide political spectrum. On the left, organizations like Extinction Rebellion have called for citizens’ assemblies on climate as a core demand. In the political center, groups like the OECD’s work on innovative citizen participation have documented hundreds of deliberative processes across member countries and promoted best practices for their design. Some right-leaning populists have also expressed interest, framing sortition as a way to bypass political elites and return power to ordinary people, though this framing sometimes papers over significant differences in what “power to the people” means in practice.

Academic interest has exploded as well. Research on sortition and deliberative democracy has grown from a niche concern in political theory to a substantial interdisciplinary field spanning law, political science, public administration, and environmental policy. The sheer number of real-world experiments, from local participatory budgeting in small towns to national constitutional conventions, means there is now a meaningful evidence base to draw on rather than purely theoretical speculation.

What remains uncertain is whether sortition can move beyond advisory functions. The Belgian model aside, most citizens’ assemblies produce recommendations that elected officials can accept, modify, or ignore. For sortition to become a durable feature of democratic governance rather than an interesting supplement, its advocates will need to solve the institutional coupling problem: how to connect randomly selected bodies to the decision-making structures that actually pass laws and allocate budgets, in ways that are both effective and democratically legitimate.