7.7 a Either snowball sampling as it would be difficult to identify members of the desired population or, possibly, convenience sampling because of initial difficulties in finding members of the desired population. b Quota sampling to ensure that the variability in the population as a whole is represented. c Purposive sampling to ensure that the full variety of responses are obtained from a range of respondents from the population. d Self-selection sampling as it requires people who are interested in the topic. e Convenience sampling owing to the very short timescales available and the need to have at least some idea of members’ opinions.