Impact Evaluation - Mixed Methods

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A mix of methods – e.g. combining qualitative and quantitative approaches - can be used to assess different facets of complex outcomes or impacts, yielding more breadth, depth and width in the portrait than can one method alone. One set of methods could be used to assess outcomes or impacts and another set to assess the quality and nature of intervention implementation, thus enhancing impact evaluation with information about program integrity and program experiences. 

Triangulation is a key concept that embodies much of the rationale behind doing mixed method research  and represents a set of principles to fortify the design, analysis and interpretation of findings in Impact Evaluation. Triangulation is about looking at things from multiple points of view, a method “to overcome the problems that stem from studies relying upon a single theory, a single method, a single set of data […] and from a single investigator” (Mikkelsen). 

Sources: 

Leeuw, Frans & Vaessen, Jos (2009): Impact Evaluations and Development. Nonie Guidance on Impact Evaluation. Draft Version for Discussion at the Cairo conference March-April, 2009. Nonie – Network on Impact Evaluation, p.48- 50. 

Mikkelsen, B. (2005) Methods for development work and research, Sage Publications, Thousand Oaks, p. 96.