Both quantitative and qualitative methods of data collection and analysis, from primary and secondary data sources, are needed to generate a clear picture of how, why and how much children and their rights are affected by a given policy or programme change.

Quantitative methods (in the form of census data, statistics and household surveys for example) can map out which children have been affected by a reform and in what general ways.

Qualitative methods (in the form of key informant interviews, focus group discussions and more participatory research with children themselves) help to answer which children are most vulnerable to reforms, why, as well as deepening analysis on lessons learned and mitigation strategies to counter any negative effects. Qualitative data collection methods are most effective for use with and by children, in keeping with their evolving capacities and levels of maturity. These can include drawing, photo-voice, mapping and many other participatory approaches.