This report has been developed to support voluntary sustainability standard setting organizations (VSS organizations), businesses, or industry groups that operate, or are seeking to partner with local third-party organizations to develop company or multistakeholder grievance mechanisms in accordance with the principles set out in the United Nations Guiding Principles on Business and Human Rights (UNGP).This document will illustrate how third-party partners can support these organizations in the design and implementation of grievance mechanisms, and provide a practical framework for selecting a suitable third-party partner.