... It is highly important as the smart city actions' planning (i.e., the selection and prioritization of them) reflects not only ambitions of some politicians (who usually focus on impressive actions, supporting their 'political marketing', but not on substantial ones that are more beneficial for the society), or the promotion plans of ICT firms (who usually focus on promoting specific products according to their marketing priorities); it is imperative that citizens' relevant perceptions, needs and preferences, as well as knowledge and ideas, should also be taken into account. This is in line with the more general trend of citizens' participation in government planning, policy making and even budgeting, in order to make them more socially rooted and responsive to citizens' problems, needs and values, and also exploit the 'wisdom of the crowd' (citizens' knowledge and ideas), and even co-create value with citizens, advancing toward a more open, participative, collaborative and smart government (Allen et al., 2020;Brun-Martos & Lapsley, 2017;Ferro, Loukis, Charalabidis, & Osella, 2013;Loukis, Charalabidis, & Androutsopoulou, 2017;Noveck, 2015;Webster & Leleux, 2018); for this purpose government agencies use a variety of techniques, both quantitative (mainly questionnaire-based surveys) and qualitative (such as focus groups-citizen panels, urban/living labs, consultation spaces, social media). However, though some methodologies have been developed concerning citizens' participation in individual smart city actions and co-production of public value through cooperation between citizens and municipal authorities (Allen et al., 2020;Castelnovo et al., 2016;Webster & Leleux, 2018), there is a lack of methodologies for citizens' participation in the higher level planning of smart city actions: for the participatory planning of smart cities interventions (Castelnovo et al., 2016;Dameri, 2017). ...