Abstract
The incapacity of Brasilian authorities to deal effectively with popular demands in education and health, coupled with the expansion of the neo‐liberal program in Latin America, are factors that point to the need for popular organized groups to create alternative data banks and develop the surveillance of health hazards. A proposal such as this implies the Joint effort of these popular organized groups together with university‐trained professionals, where both groups would seek to combine the knowledge they produce. The methodological implications of this proposal for alternative modes of investigation are discussed in this article, especially with respect to the difficulties implicit in undertaking this kind of research in a large Third‐World metropolis such as Rio de Janeiro. In this sense, it is suggested that a combination of techniques be utilized, with the emphasis on Informal methods, and especially the field diary as a community data mosaic.

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