Mixed research methods provide a more comprehensive set of data upon which to make design decisions. This method is a combination of qualitative research strategies complementing quantitative research activities, which together provide a more complete body of valuable data.
Creswell, J.W., 2009. Research design: Qualitative, quantitative, and mixed methods approaches. 3rd ed. Sage, London.
Creswell, J.W. and Plano-Clark, V.L., 2006. Designing and conducting mixed methods research. Sage, London.
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