The framework developed within Timbre WP1 constitutes the core structure of the Expert System and it is a scheme composed by a set of information categories corresponding to the different idealised phases of the brownfield redevelopment process. The framework represents the structure of the Expert System database containing web links to relevant documents and information in the field of brownfield regeneration, and at the same time supporting end-users in exploring the Expert System and searching for specific information. The framework has been developed through a participatory process, by involving and consulting stakeholders through workshops and focus groups and with an on-line questionnaire.