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A summary assessment of the evidence underlying the impact of the four main Water, Sanitation and Hygiene (WASH) interventions on diarrhoea according to seven ‘points of view’ is also scored as ‘favourable’, ‘intermediate’ and ‘unfavourable’. This shows the degree to which, from each viewpoint, the available evidence supports or undermines the case for implementation of each intervention. The scoring given for each cell of the table reflects the individual gradings given for the strength of evidence throughout this paper.