“…It refers to the level of analysis, i.e., considering the diffusion process at the international level, country level, or sectoral level, for example. Studies analyzing the diffusion of MSSs, specifically ISO 9001 and ISO 14001, at the international level are the most common: these studies allow introducing the model and its stages and analyzing and comparing the diffusion among countries, such as in Franceschini et al (2004Franceschini et al ( , 2006Franceschini et al ( , 2010, Marimon et al (2006Marimon et al ( , 2009, Casadesús et al (2008), and Heras-Saizarbitoria et al (2013, 2015. At the national level, e.g., Franceschini et al (2008) analyzed the diffusion in Italy, and Casadesús et al (2010) and Alonso-Almeida et al (2013) analyzed it in Spain.…”