“…Nonetheless, despite the upturn in the number of these reports not accompanied by an increased level of public trust (Hodge, Subramaniam, & Stewart, ), there are many who are concerned about the lack of credibility, transparency, and consistency of sustainability reporting and the need for an assurance process which ensures such quality aspects (Adams & Evans, ; Gómez‐Bezares, Przychodzen, & Przychodzen, ; Simnett et al, ). These concerns have led to calls for the adoption of an independent assurance of sustainability reports, which is defined by Global Reporting Initiative (GRI) () as “activities designed to result in published conclusions on the quality of the report and the information contained within it.” Thus, the decision on external assurance is a voluntary decision that may be taken with the aim of improving the credibility of sustainability reporting and consequently increasing the transparency, relevance, and reliability of such information (Cohen & Simnett, ).…”