“…Selection of attributes and definition of attribute levels A primary selection of attributes has been conducted through a literature review on preferences regarding access to UGS. UGS public acceptability has been shown to vary depending on the distance to UGS (Choumert and Travers, 2010;De Valck et al, 2017;Kong et al, 2007;Sander and Polasky, 2009), type of vegetation (Brun et al, 2017;Bullock, 2008;De Valck et al, 2017, Rulleau et al, 2010Schindler et al, 2018), size (Bullock, 2008), presence of water (Ives et al, 2017;De Valck et al, 2017), type of facilities (Suarez et al, 2020;De Valck et al, 2017;Bertram et al, 2017;La Rosa et al, 2018), and cleanliness (Rulleau et al, 2010;Bertram et al, 2017). After this first selection, planning stakeholders' of the Ile-de-France region have been consulted during the IDEFESE 6 project focus groups (Tardieu et al, 2021).…”