I believe this article is highly relevant to the dicussion of how to design processes for co-creation. Have a look.
Abstract
The field-process-model is a theoretical framework the Institute for Participatory Design developed to understand generative design processes as dynamic interactions of forces in a field. The development of this model became necessary after we encountered numerous theoretical and practical problems with the application of our former, more systemic oriented, understanding of pattern languages and design processes. The field-process-model explores the idea that a field with its forces (as used in numerous pattern languages) is the spatial description of a process, which in turn is the temporal description of a dynamic field. The model gives us a good understanding of how generativity and emergence unfold and how we as designers can foster these qualities in our design processes. Beneath the question of the emergence of new (design) ideas, the model also helps to investigate qualities such as immergence, crisis or bifurcation and of cultivation for generative processes. With the framework the field-process-model describes, we can develop applicable tools and strategies for actual design. The goal is to design in open and flexible processes that are alive and create results that are alive.
http://blog.partizipativ-gestalten.de/2011/11/the-field-process-model/