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Dimension: Representativeness
Reach participants
Ability to reach potential participants (e.g., to mitigate biases around self-selection, who is reachable, etc.).
How this is performed now...
Panel providers
Panel providers typically maintain large pools of pre-recruited participants from which they draw. They may actively recruit to fill any gaps, as these lists are typically unrepresentative of the wider population.
Citizens' assembly organizers
Citizens’ assemblies organizers commonly recruit with 2-stage democratic lottery, which involves a round of mailed invitations and then a round of stratified random selection. There is also some use of door-knocking, random phone number dialing, and other recruitment methods. In the global south, where the infrastructure that these approaches rely on can be scarce, alternative in-person methods have been used.