Research and Measurement Methodology 40
d. Snowball Sampling
 Snowball sampling is a method for identifying and sampling the cases in a 
network.For example, if we running a survey on street children/or carrying out a survey of 
risk behaviors amongst intravenous drug users, there will be no list with the 
homeless children and it will be difficult to locate this population in one place e.g. a 
school/hospital.Instead of the researcher choosing participants and directly 
contacting them, people volunteer themselves (e.g. by responding to a public online 
survey).