The most traditional is the collection of primary information. Talk to people to find out what they think, count how many children they have, how many houses on your street. Some of this information, for larger areas and in aggregated form, may be available from official sources - but that is not really traditional. Censuses are a relatively modern innovation.
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some sources of data are information
multiple sources
Documentary Sources- books, journals,magazines of any format Institutional Sources- school /colleges, govt. offices, NGOs Human sources- Govt. official, elite group,religious/holy priest Virtual sources- web sources
AnWhat is a good initial technique to apply when proofreading an email?
a primary source would be first hand from an educated certified doctor or something like that. a secondary source would be information from someone...like me!