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This is an umbrella project about sourcing in genealogy. Please don't add any profiles but feel free to collaborate and contribute. It's a large topic, so please set up "related" projects to cover more specific areas.
Usually we trust sources more the closer they are in time to the events they write about. For example, birth information is more likely to be correct on a birth certificate than on a death certificate.
But at the same time we need to have in mind that the author or the one commissioning the book, may have an agenda for writing what he/she does. We always have to use our critical sense when reading books and try to find other independent writers that have written about the same events so we can get some collaborative information. This is specially important in an online community like Geni, so we don't add wrong information to our genealogies which will spread out like viruses.