Alatinga, K. A., & Williams, J. J. (2019). Mixed methods research for health policy development in Africa: The case of identifying very poor households for health insurance premium exemptions in Ghana. Journal of Mixed Methods Research, 13(1), 69–84. https://doi.org/10.1177/1558689816665056

Alatinga and Williams (2019: 80) discuss areas of concordance but also two clear examples of discordance between survey and focus group data that were found when designing criteria to identify those eligible for reduction of health insurance premiums in Ghana due to poverty.

Spillane, J. P. (2010). Mixing methods in randomized controlled trials (RCTs): Validation, contextualization, triangulation, and control. Educational Assessment, Evaluation and Accountability, 22(1), 5–28. https://doi.org/10.1007/s11092-009-9089-8

Spillane (2010) describes an RCT of a programme that failed, yet yielded valuable programme information through an analysis of conflicts between different data sources used in the evaluation.