Quantitative information is important to measure what is being achieved and assess progress towards objectives. Quantitative information is often favoured as it is collected routinely (through the monitoring system) and is easy to aggregate and communicate. Moreover, number-based results can be compared and are perceived as more objective than qualitative information.
Qualitative information is vital to complement quantitative information and document how change is happening. It is best suited for measuring progress that is complex, multi-faceted or multidimensional. Qualitative information increases understanding of the diversity of causal pathways for different constituents. It also helps to account for the institutional and human dynamics that affect outcomes, enabling the information on why interventions work in some places and not in others. Qualitative information in the form of stories and narratives is also crucial to communicate with people and engage with the public.
Qualitative information is often perceived to be impressionistic. It is more easily questioned for bias, often being criticised for ‘cherry picking’ cases. Gathering robust qualitative information around attitudes, behaviour, relationships, influence, systems, power dynamics, social norms and public goods is indeed challenging. Institutions need to go beyond stories of change and case studies towards more rigorous approaches, including qualitative research methods, to measure and show qualitative results.
Bringing numbers to qualitative results can facilitate their communication and use. Hybrid (or mixed) indicators quantify qualitative data, involving qualitative assessment factors (e.g. using checklists) for measuring them. They best capture data on multifaceted concepts like efficiency or participation. Hybrid indicators are measured by indexes, milestone scales or scorecards.
Qualitative indicators are also possible and can be preferable for measuring performance in certain areas, for instance in the democracy and governance sector. They take the form of a narrative assessment that measures change over time against specific, predetermined criteria.