There can be many reasons why a particular population may be hard to reach. They may represent a very small but critical group, or they may be reluctant to participate in a survey for many reasons.
These hard to reach small populations can be found through careful, targeted recruitment using in-house and third party sample sources. It also requires careful consideration of the interview from the respondent's perspective.
We employ a small group of mature, highly experienced professional interviewers whose job is to get past gate keepers, make our schedule fit the people we need to interview, be respectful, persistent and always professional.
Some of our recent studies with hard-to-reach populations include: