Introduction or preface

- This paper offers a contribution to the analysis of the processes of transition of the food systems, that are sustained by the innovations introduced by reflexive consumers. After reviewing the literature on consumption as driver of change, the authors propose to explain consumption models and consumers' identities in the Summaries framework of innovation theories. The analysis is applied on consumers solidarity purchasing groups. Their innovative role is expressed by the capacity of coproduce, together with other actors, new structures, material and immaterial, for everyday life. This implies as well a re-definition of boundaries between consumption and production, commodities and services, private and public, domestic and civic. Key words: innovation networks; transition theory; critical consumption; sustainable development; solidarity purchasing groups; citizens-consumers.