2. The Sustainable Development Goals and solutions to statelessness technical refinement.70 In its report to the Statistical Commission, the IAEG-SDGs indicated that the Global Indicators should be grouped into three ‘tiers’, based on their level of methodological development and overall availability of data.71 Tier I Global Indicators are those for which an established methodology exists and where data is widely available. Tier II Global Indicators are those for which a methodology has been established, but for which data is not easily available. Tier III are those for which an internationally agreed methodology has not yet been developed.72 The Global Indicator proposed to track progress in implementation of SDG 5, Target 5.1 is “whether or not legal frameworks are in place to promote, enforce and monitor equality and non-discrimination on the basis of sex” (Global Indicator 5.1.1). This Global Indicator is envisaged to fall within Tier III. Accordingly, until an adequate methodology for its measurement is developed and relevant data sources are identified, there is a risk that States will not seek to implement Target 5.1. It should be noted that the goal of Action 3 of the GAP (which is the #IBelong Campaign’s correlate to Target 5.1), will be achieved when “all States have nationality laws which treat women and men equally with regard to conferral of nationality to their children and with regard to the acquisition, change and retention of nationality”. To ensure that Target 5.1 also results in the reform of nationality laws that discriminate against women and cause statelessness, it will be critical that the methodology developed to measure Global Indicator 5.1.1 includes nationality laws amongst the legal frameworks that are evaluated and asks the following questions of those laws: 70 71 72 UN Statistical Commission, Report on the 47th session, 23 March 2016, E/2016/24-E/CN.3/2016/34. Inter-Agency and Expert Group on Sustainable Development Goal Indicators, Provisional Proposed Tiers for Global SDG Indicators, 24 March 2016. The tier system was discussed at the third meeting of the IAEG-SDGs from 30 March – 1 April in Mexico City, where it was agreed that the Group would finalise the initial tier system, taking into account inputs from UN entities, by 29 July 2016. See, UN Department of Economic and Social Affairs Statistics Division, Report of the Third Meeting of the Inter-Agency and Expert Group on the Sustainable Development Goal Indicators, 28 April 2016, ESA/STAT/ AC.318/L.3. 64