Modern research recommends that researchers apply the Mixed Method Research Approach to developmental research studies.
This is both Quantitative and Qualitative data that have to be collected from the field. The former is from the sampled respondents, and the latter is from the non-sampled respondents, like Focus Group Discussions and Key Informants Interviews at the local level.
Most development practitioners and Social Science researchers are interested in using this Mixed Methods Research Approach.
The main advantage of using this mixed-method approach is that it could help the researchers ascertain the results' validity and reliability.
This Quantitative data can be triangulated with the Quantitative data to measure the validity of the research.
I think you have answered your own question in your narrative above. However for me, a short answer is that it is all about 'depth', and validity.
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