In some countries public participation has become a central principle of public policy making. In the UK and Canada it has been observed that all levels of government have started to build citizen and stakeholder engagement into their policy-making processes. This may involve large-scale consultations, focus group research, online discussion forums, or deliberative citizens' juries. There are many different public participation mechanisms, although these often share common features (for a list over 100, and a typology of mechanisms, see Rowe and Frewer, 2005).