20 survey results In the OSCE region, there are three principal NHRI models: 45% of NHRIs are human rights commissions with an explicit human rights mandate. 11% of NHRIs are ombudsperson offices with a general maladministration mandate, and no specific human rights mandate. 26% of NHRIs are hybrid institutions, combining human rights and maladministration mandates. Other less common models include human rights advisory commissions and research institutes. ! The ODIHR survey suggests that neither model can be considered more or less conducive to protecting and promoting women’s rights or gender equality. HANDBOOK FOR NHRIs ON WOMEN’S RIGHTS AND GENDER EQUALITY The United Nations Principles relating to the Status of National Institutions (The Paris Principles)12 formulate the minimum standards an NHRI must meet to be considered credible by its peers and within the UN system. These include a broad mandate, autonomy from government, independence, pluralism, adequate resources and adequate powers of investigation. 13 There are a  variety of acceptable nomenclatures and models of NHRIs. No single terminology or nomenclature is generally accepted as definitive. In fact, the proliferation of institutions that have a wide range of mandates and institutional features has made the task of classifying NHRIs more, rather than less, complex over the years. The Paris Principles set out minimum standards for the roles and responsibilities of NHRIs but do not dictate how NHRIs are to be organized at the national level. That said, NHRIs can be grouped in three main categories in the OSCE: human rights commissions, ombudsperson offices and hybrid institutions. Human rights commissions have an explicit human rights mandate to investigate human rights violations, combined with broader advisory and educational roles. They are sometimes established to address specific issues, such as anti-discrimination or equality. In most cases, however, they have responsibilities over the full range of human rights. 12 United Nations General Assembly Resolution A/RES/48/134, 20 December 1993, Annex 1. 13 For further information see: National Human Rights Institutions: History, Principles, Roles and Responsibilities, OHCHR Professional Learning Series No. 4 (Rev.1), OHCHRHR/P/PT/4/Rev.1, 2010.