Snowball Samples. commonly used in field research studies or qualitative interviewing. begins by identifying a single subject or small number of subjects and then asking the subjects to identify others like him or her who might be wiling to participate in the study.
Sampling. selecting some units of a larger population for further study. In selecting a group of subjects for study, social science resorts oftenest some type of sampling. in general sampling refers to selecting part of population. process of selecting observations.