[Problems of sampling and fieldwork in community health studies]

We analyse in this paper, from the experience acquired in different community surveys, some methodological aspects which we consider essential for the development of these projects. The aspects reviewed are integrated in the following three fundamental areas: --Costs and financing. --Sampling strategy. --Field work: preparation and execution. The advantages and disadvantages of the different possible alternatives, in each of the three areas, are discussed on the light of the data obtained in the project which on "Alcohol related problems" we are conducting in Cantabria.