Random, Each sample has an equal probability of being chosen – random number generator/hat., Systematic, Individuals are selected at regular intervals from the sampling frame – e.g. every 10th person in 100., Stratified, Population is first divided into subgroups (or strata) who all share a similar characteristic. Study sample is then obtained by taking equal/proportionate sample sizes from each stratum., Convenience, Participants are selected based on availability and willingness to take part., Quota, Interviewers are given a proportionally representative quota of subjects of a specified type to attempt to recruit – e.g. 20 adult men, 20 adult women, 10 teenage girls and 10 teenage boys, Snowball, Existing subjects are asked to nominate further subjects known to them, so the sample increases in size like a rolling snowball.

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