... Behaviour:Importance for PublicHealth Mechanisms of Change 9Whenlearning,peopleremember20% of whattheyhear, 40% of whattheyhear and see, and 80% of whattheydiscover for themselves.(Hope and Timmel1984:103)methods,based ... suchasthepresence of germs and thesymptoms,transmissionroutes and prevention of water and sanitation-relateddiseases.Educatorswhich aim for people’sunderstandinghaveinsightinto and respect for localknowledge,practices and beliefs and use ... serioushealthrisk and areconsideredafeltneedbythepopulation.IndryareassuchasonaplateauinMozam-biqueashortage of wateroftengoeshandinhandwithahighincidence of skin and eyedis-eases.Itwasnotthediseases,but thescarcity of drinkingwater and thelongdistancesthatwerethefirstneed of thevillagers.Butwhenwater-pointswerebroughtcloser and areliable and predictableservice...