 Upon completion of Phase 3, or phase 2 if no phase 3 is conducted, we will conduct a final handwashing behaviour change assessment Phase 4 in the study area in the phase 2 villages, and in a further district in Bihar to assess the impact of the intervention on handwashing behaviour across a wider area, and the sustainability of the changes. This phase will use the same methods as in Phase 2, and also include an economic evaluation of the programme. 