Factor – interviewer activity Mean (scale of 1: not stressful
at all to 4: very stressful)
Factor 1: Activities which may cause a break-off 2.64
 Conducting an interview with a respondent, who picks
 on many questions, complains about their pointlessness,
 incorrectness, etc. (0.807)
2.85
 Introducing an interview with an aggressive respondent –
 who is shouting, using threats, etc. (0.791)
2.85
 Conducting a long interview, lasting over 30 minutes (0.586) 2.62
 Refusal conversion – persuading a respondent, who refused
 earlier during a previous call (soft refusal), to participate in
 the research (0.710)
2.26
Factor 2: Activities which may cause cognitive difficulties to the interviewer 2.03
 Conducting an interview with a hard of hearing respondent
 (0.773)
2.54
 Conducting an interview with a respondent, who has a serious
 speech impediment – stutter, unclear speech, etc. (0.809)
2.26
 Writing down a respondent’s very long answer to an open-
 ended question (0.627)
1.82
 Conducting many different projects within a single shift (0.475) 1.53