Since ISEAL launched the Credibility Principles in 2013, the sustainability landscape has continued to evolve, shaped in part by the learning and innovations of ISEAL members. In 2019, we launched a review of the principles to find out how they have been used and adopted. The outcome of the review will decide whether the principles need to be revised to adapt to new international frameworks and norms, changing stakeholder expectations or innovations in sustainability tools, and, if so, the scope of the revision. This document contains information about the review objectives, process and opportunities for involvement.