This article presents an empirical study of six grievance mechanisms in multi-stakeholder initiatives (MSIs). It argues that key characteristics of each grievance mechanism as well as the contexts in which they operate significantly affect human rights outcomes. However, even the most successful mechanisms only manage to produce remedies in particular types of cases and contexts. The research also finds that it is prohibitively difficult to determine whether ‘effective’ remedy has been achieved in individual cases. Furthermore, the key intervention by the UN Guiding Principles on Business and Human Rights (UNGPs), to prescribe a set of effectiveness criteria for designing or revising MSI grievance mechanisms, itself appears ineffective in stimulating better outcomes for rights-holders. Drawing on these findings, the article reflects on the future potential and limitations of MSI grievance mechanisms within broader struggles to ensure business respect for human rights.

This article explores different approaches to assessing the effectiveness of non-state-based non-judicial grievance mechanisms (NSBGMs) in achieving access to remedy for rightsholders. It queries the approach that has been widely adopted as a result of the United Nations Guiding Principles on Business and Human Rights (UNGPs), which focuses on the procedural aspects of grievance mechanisms. Rather, it stresses the importance of analysing the outcomes of cases for rightsholders. This article tests this hypothesis by undertaking comprehensive empirical research into the complaint mechanism of the Roundtable on Sustainable Palm Oil (RSPO). RSPO is found to perform well when judged according to the UNGPs’ effectiveness criteria. However, it performs poorly when individual cases are assessed to ascertain the outcomes that are achieved for rightsholders. The article therefore argues for the importance of equivalent scrutiny of outcomes in relation to other NSBGMs and provides an approach and accompanying methodology that can be utilized for that purpose.