“…Borgstedt et al, 2017, Comyns and Figge, 2015, Gürtürk and Hahn, 2016, Rossi and Tarquinio, 2017 due, among other similar reasons, to its ability to analyze whether companies report consistently over several years or whether significant changes are introduced (Borgstedt et al, 2017). As underlined in a set of works in the field of sustainability reporting -see for example among these recent ones: Borgstedt et al, 2017, Comyns and Figge, 2015, Gürtürk and Hahn, 2016, Rossi and Tarquinio, 2017 -the longitudinal approach might add value to the fieldwork carried out for the mentioned and other similar reasons. Because of the time lag between the year covered by the sustainability report and its publication date, certain reports pertaining to a particular year were released a year later or even more, and some reports cover two consecutive years.…”