“…Compared to structured formal standardized system of education (i.e., schools, universities), there is a lot of discussion about the context and the characteristics of learning in the museums which do not require specific qualifications, assessment according to external standards, etc. (Hein, 1998;Hooper-Greenhill, 2006Kanari & Souliotou, 2020). Based on criteria related to a. the organizational and administrative differences between formal structured education and other learning environments, as for example museums (Hein, 1998), b. the characteristics of learning in the museums which are more flexible, open, experiential and audience-centered, (Black, 2005(Black, , 2012Hein, 1998;Hooper-Greenhill, 2007), and c. the type of the activities and the target audiences within museums (Black, 2012;Hein, 1998;Hooper-Greenhill, 2007;McGhie, 2020), researchers of the museums" field adopt the terms "informal" and "nonformal" learning alternatively to describe different type of activities and characteristics of learning in the museum (see, e.g., Hein, 1998;Hooper-Greenhill, 2007;McGhie, 2020;Nikonanou, Bounia, Bennett & Kirwan, 2020).…”