ICT, thanks to innovative models for participatory planning and governance, opens the door to the development of new ways of users’ engagement in the design and planning of their environments.

New scenarios are now possible in which active users/citizens can help gathering sensible data through participatory sensing and social computation activities, with the twofold purpose of:

(i)                 stimulating individual and collective awareness and learning; and

(ii)               providing relevant inputs for data analysis, modelling and decision making.

It has been emphasised that techniques such as narratives, games or even art may be important vehicles for expressing evidence and forming opinion. However, this “human-centred” aspect, stressed by Global System Science – GSS www.global-systems-science.eu , including citizen participation, is clearly concerned with reasoning.