The European Institute on Public Participation has published together with the Bertelsmann Foundation a systematic comparison of public participation models used in poilcy-making (pdf, in German). In particular the study focuses on large-scale deliberative models and how they are used by whom. These models include everything from Appreciative Inquiry to Participatory Budgeting to Future Workshops.
The handbook is intended for policy-makers, pracitioners of public participation and researchers. It explicitly follows a systematic, though application-oriented approach. This helps to compare the remit and merit of each model. They are analysed according to …

As polities become larger and more heterogeneous and their tasks more complex, the erosion of democratic vitality may seem inevitable. But perhaps the problem is not the size and heterogeneity of a polity nor the tasks political institutions face as such, but the way they are designed to address them.
What is needed is a fundamental revitalization of democratic practices, which will empower ordinary citizens in new ways.
In this paper we set out a vision of how to establish participation in real world settings and sketch out the biggest challenges …