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In my experience the big leap is one latrine per family / household whatever the exact figures are. People in a family / household will be comfortable sharing a toilet, will be interested in keeping it clean and be able apply sanctions to anyone who misuses it! Excellent point about next best being when a number of households share a toilet where space is tight - which usually means padlocked or similar with keys held only by those sharing use and cleaning. Again number is not so important as how people have organised themselves to keep latrine usable and used. I guess next best might be paying public toilet with attendant but I do not have direct experience in developing countries.