In sociology and statistics research, snowball sampling (or chain sampling, chain-referral sampling, referral sampling) is a non-probability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Thus the sample group appears to grow like a rolling snowball (similarly to breadth-first search (BFS) ...
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http://en.wikipedia.org/wiki/Snowball_sampling
A method whereby interview subjects for a statistical study are obtained from subjects already interviewed for that study.This technique is most often used with target populations made up of elusive or uncooperative subjects (e.g., IV drug users). Those subjects first contacted are asked to name acquaintances, who are then approached, interviewed, ...
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http://www.encyclo.co.uk/local/20973
Type: Term Definitions: 1. a method whereby the names of prospective interview subjects for a statistical study are obtained from subjects already interviewed for the study.
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http://www.medilexicon.com/medicaldictionary.php?t=79565
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