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The development by private organizations of tools aimed at defining, implementing and evaluating corporate social responsibility (CSR) introduces a series of new constraints on negotiations processes. The attention given to requirements in terms of legitimacy, inclusiveness and transparency is becoming a must for the producers of private standards in the field. The article investigates the setting process of ISO 26000, international guidance standard on social responsibility published in November 2010. Studying this case is interesting because the negotiations focused not only on the content of the standard but also its development frame. Rather than trying to identify the objectives of the categories of stakeholders given by the organizers, we analyze both the discussions on the content and the impact of new rules of procedure on the negotiations. Keys issues in the development of ISO 26000 (its source, degree of constraint and field) are related to the modifications of the ISO procedure. The analysis of the new rules can teach us a lot, upstream on the key issues related to the process and, downstream, on the weightings given to requirements in terms of efficiency and justice.