A/69/302 ensure that the former are not made into auxiliaries of the latter and are able to perform their duties and missions without interference, including in the collection of data concerning migrants in an irregular situation. Without such firewalls, many migrants in an irregular or precarious situation will systematically avoid being identified by such public services. 100. For meaningful national plans, policies and programmes to be developed and implemented, States must focus on collecting and assessing data on the human rights situation of migrants. States can collect data from sources such as censuses, population surveys, labour force and household surveys, administrative records, public services, the justice system, national human rights institutions, trade unions and civil society organizations. The participation of hard -to-count migrant populations, such as short-term, circular, irregular and child migrants, trafficked persons, refugees and asylum seekers, in the design of surveys and other data collection instruments and in the dissemination and analysis of data will improve the relevance and quality of data. Migration governance institutions should also be able to ensure that the data, including the identities of those who participated in the production thereof, are protected and kept confidential. 101. Data collection should focus on the human rights aspects of migration and be disaggregated, preferably, by all prohibited grounds of discrimination, including by income, urban/rural area, sex, age, disability, nationality, sector of employment and legal status. By itself, however, disaggregation does not automatically result in the reduction of inequalities. It is the action of policymakers in response to the information revealed by disaggregation that can result in the required change, which must then be reflected when setting targets and indicators. 102. To ensure that no one is left behind, the post-2015 agenda needs to pay specific attention — across goals — to the outcomes of marginalized groups, including migrants. It should therefore ensure systematic disaggregation of indicators by nationality and migrant status under releva nt goal areas, in order to measure the progress of marginalized migrant groups, including by identifying structural discrimination. As demonstrated earlier, this should also include developing specific migrant-sensitive targets under relevant goal areas. 103. In response to the need for better qualitative and quantitative data on human rights, OHCHR has developed a methodology for developing human rights indicators, collecting and disaggregating data at the global and national levels, which could ensure that migrants are neither excluded from disaggregation, owing, among other things, to their status as non-nationals, nor “left until last”. OHCHR recommends the development of structural, process and outcome indicators. This configuration of indicators should help to assess the steps being taken by States to address their obligations — from commitment to and acceptance of international human rights standards and adoption of laws and regulations (structural indicators), to how they have been implemented through policies, programmes and budget allocations (process indicators) and to their results from the perspective of migrants and members of their families (outcome indicators). 29 OHCHR is working with the Global Knowledge Partnership on Migration and Development, the United Nations Children’s Fund and the International Labour Organization to develop human rights __________________ 29 24/26 OHCHR, Human Rights Indicators: A Guide to Measurement and Implementation (HR/PUB/12/5). 14-59006