Adaptation in rural water, sanitation, and hygiene programs: A qualitative study in Nepal.

Adaptations are modifications made to programming to improve effectiveness or contextual fit, and are important for program improvement. However, adaptations can be detrimental if they do not preserve an intervention's underlying theory of change. We present a case study of 45 adaptations made to rural WaSH programming in Nepal, identified through qualitative interviews with implementers conducted in June through August 2019. For each adaptation, we characterized its target outcomes and implementers' motivations for making the adaptation, and we assessed the adaptation's intended and unintended effects on program quality. Participants described adaptations to both interventions (e.g., changes to hygiene promotion messages) and implementation strategies (e.g., sanctions to enforce toilet construction, such as denying work permits to households without a toilet). Adoption was the most common target outcome, specifically increasing toilet construction. Other target outcomes included feasibility of program delivery, acceptability of messages or WaSH products, reach of program activities in the community, and sustainability. Implementers were commonly motivated by intense pressure to meet national open defecation free targets. Most adaptations achieved their target outcomes. However, sanctions adaptations had substantial unintended negative effects. Implementers reported that sanctions were unpopular with communities and had poor sustainability. In contrast, non-sanctions adaptations that targeted outcomes of feasibility, acceptability, and sustainability had few unintended negative consequences. Our findings suggest that adaptations to promote rapid adoption of toilet construction do not consistently achieve sustained behavior change. Furthermore, adaptations to improve feasibility of program delivery or cost and acceptability of WaSH products can indirectly improve adoption even when it is not an explicit target outcome.