There is a range of “how to” publications for representative deliberative processes. Thos of which I am aware are:
A manual, originally issued in 2019, entitled Enabling National Initiatives to Take Democracy Beyond Elections. A joint project of the UN Democracy Fund and the newDemocracy foundation. The manual can be viewed online or downloaded. After a general introduction, the manual is presented in chapters each addressed to a different audience within government: politicians, department heads, project owners, project teams, and facilitators. There is also a final chapter on evidence from around the world.