In search of a solid frame of reference for comparing various international citizen assembly processes I am investigating, I discovered an excellent paper called ?Public Participation Methods: A Framework for Evaluation? by Gene Rowe and Lynn J. Frewer, two Ph.D.s working at the Institute of Food Research in Norwich, United Kingdom.

I copied and pasted together all nine key criteria defined in the paper and their related suggestions. You can use these criteria and suggestions to help plan and evaluate any stakeholder engagement processes you are involved with, such as members surveys, focus groups, public hearings and citizen juries. I think you will find it very useful.

See the criteria copied here:
http://get.cooptools.ca/evaluation_criteria_rowe_frewer

Let me know if you know of other (better?) criteria.??

I found ?Practical Guide for Evaluating Participatory Processes? (PDF) by the International Observatory of Participatory Democracy (OIDP - spanish acronym). But I'm not that impressed in the ambiguity of the criteria, the redundancy between criteria and the lack of reference to foundational research. See my summary at http://get.cooptools.ca/oidp_evaluation_criteria