Citizens’ Assembly on Brexit: how were the members selected?

The Citizens’ Assembly on Brexit – a group of citizens that will consider options for Brexit – meets for the first time today. In this post Alan Renwick, Rebecca McKee, Will Jennings and Aleksei Opacic explain the process by which members were selected to be representative of the UK electorate, both demographically and in terms of how they voted at the 2016 EU referendum.

Over two weekends this month in Manchester, the Citizens’ Assembly on Brexit – a group of around 45 citizens – will meet to learn about, deliberate on, and make recommendations relating to the options for Brexit. As we set out in a previous post, the Assembly follows a well-established model for fostering quality public deliberation around major policy decisions. One key feature of this model is the process through which the members are selected. They are not elected or allowed to self-select. Rather, they must be identified through a rigorous process of random selection designed to ensure that – so far as possible for a group of this size – they reflect the diversity of the wider population. This post sets out how we have done that for the Citizens’ Assembly on Brexit and what we can say so far about the results.

Basic principles

Our goal has been to secure a broadly representative sample of the population. The relevant population in this case is the UK electorate: the people who are entitled to participate in public decision-making in the UK. It is their views that need to be heard by policy-makers involved in deciding the UK’s approach to Brexit.

Achieving a representative sample is far from straightforward. It relies on careful planning and design, as well as reflection, long before an assembly takes place. The first step is to decide what it actually means to be representative of the population at large. This is normally determined through stratification: you decide in advance what proportions of certain groups must be included, or set minimum levels for people from each group. Past citizens’ assemblies in places such as Ireland and Canada have used various stratification criteria, including age, ethnic background, geography, social class, and employment status. Each characteristic can be treated more or less strictly, depending on the context of the assembly. All official citizens’ assemblies have required equal numbers of men and women. In Canada, which has specific issues with ethnic inequalities, assemblies have required minimum numbers of people from the First Nations.

The stratification design is only the first step. Next comes the process of finding people to fill the stratification quotas. We know very clearly that one potential method – allowing people to self-select into the assembly, doesn’t work. Those who opt in are usually very different from those who don’t, most notably in terms of their levels of political interest and participation: they are more likely to have an interest in politics and to be already engaged in political activities. Self-selection may also attract people with particularly strong views about the topic of debate. Additionally, they are more likely to be people with plenty time to attend: those without caring or childcare responsibilities, those who are older and retired, and also people who can afford to take the time off work. To avoid the major issues of self-selection into a citizens’ assembly, some method of random selection is required.

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