RESUMO
It was studied a change in the children's beliefs and behaviour with regard to their handling of drinking-water by using a teaching-learning experience by means of microscopic observation of polluted water. A structured pre-test on problem-solving were administered to 63 6th and 7th grade elementary school children (28 boys and 35 girls). An of these children came from an underprivileged population in the north of Buenos Aires, Argentina. Their average age was of 12 years 8 months and SD = 1 year 1 month. Each adequate aspect of their behaviour scored one point: hygiene and protection of containers for collection and storage, water treatment (boiling or the addition of chlorine) and the conservation period. The best beliefs ("to avoid the water contamination that produces illness") scored two points. The number of pupils that changed their beliefs and and behaviour in the post-test was established and the significant difference was found by means of Chi square test (X2). The children did not, in general, improve their behaviour or beliefs. They maintained adequate hygienic behaviour, but did not put into practice the protection of the containers used for the collection. Behaviour regarding storage was still inadequate. The pupils did acquire correct behaviour as regards storage was still inadequate. The pupils did acquire correct behaviour as regards treatment by the boiling of water or the addition of chlorine (P less than 0.01). However, the beliefs involved did not change.(ABSTRACT TRUNCATED AT 250 WORDS)
