The rewards given out to respondents for participating in the research studies are called incentives. The incentives vary from study to study and from company to company.

The person who administers a questionnaire for a certain study or recruits people for a focus group discussion is called an interviewer.

In-house recruiting is when the focus group participants are from the company’s database or are physically present in the company facility.

Interviewer error is the bias introduced by the interviewer during the process of the interview. This error may be induced unconsciously or consciously simply because of faulty interviewing techniques.

Interviewer’s instructions are the written instructions given to the interviewers prior to an interview. These are guidelines as to how the interview should generally proceed.