Dispensable soap tabs to increase handwashing in poor areas PLOSONE
The solution is thus thought to be effective because it is a product-service system. That is, the product itself has important features of cleanliness and novelty that influence perceptions and create a reminder but the refill of the soap supply, e.g. through soap sellers in local communities, can create a reinforcing environment for the behaviour and stronger assurance that the product is available.
The different kinds of evidence from the field trial—interviews with participants, seller documentation, data logs and field worker interviews—together paint a persuasive picture of use . The interviews support the case for these tabs being almost always used for handwashing, which was an important dimension of our objective. The sensor data, although not complete due to technical difficulties, does not appear to be biased by household, and indicates regular use throughout the trial period.
There were several limitations to the study. The creative process was constricted due to a limitation of resources, including time. First, we developed prototypes in London and made minor modifications in the field. A better approach would be to design and test more prototypes in the relevant situation–in Tanzania. In this work, we also prioritised behaviour change and desirability with an eye to technical feasibility and business model viability.
Finally, the current study did provide compelling early evidence for behavioural change but this iteration of tab soap would not be a solution without a viable and scalable model to bring the soap to many. Indeed, providing free soap which carries novelty to end users is bound to be well received. We did endeavour to create a solution which could be sold at a reasonable price point for the target demographic. However, this does not answer the question of market feasibility.
Its price-point per use is comparable to alternatives such as a liquid soap bottle push or bar soap rub.Its use probably requires less water than other forms of soap as the substrate holds water throughout use, lubricating the washing process.
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