This guide is the fourth to be developed in partnership with the Centre for Social Responsibility in Mining (CSRM), part of the sustainable Minerals Institute at The University of Queensland. Other guides include Why gender matters, Why cultural heritage matters and Why human rights matter. To capture agreement experience and promote good practice concepts and approaches, this guide has been reviewed by two groups - a group of Rio Tinto reviewers from different departments and geographical locations, and an External review panel of experts in agreement-making.