Agent / Interviewer Bias
Issue: Tone, paraphrasing, selective probing, or over-helping can reshape the response.
Control: We use tight scripts, standardized probes, monitoring, retraining, audio audits, and performance scorecards.
Questionnaire Bias
Issue: Leading, loaded, or double-barrel questions force distorted answers.
Control: We use neutral wording, split questions, balanced options, and cognitive testing.
Skipping / Routing Bias
Issue: Incorrect routing pushes respondents into the wrong sections and corrupts the instrument.
Control: We enforce tool-led skips, validations, mandatory checks, and simplified agent interfaces.
Non-Response Bias
Issue: Unreachable people may systematically differ from reachable respondents.
Control: We use callback schedules, mixed modes, reachability analysis, and non-response weighting.
Coverage Bias
Issue: A single mode can exclude parts of the target population.
Control: We improve frames, use hybrid modes, and report explicit caveats and corrections.
Social Desirability and Recall Bias
Issue: Respondents may answer what feels acceptable or remember events incorrectly.
Control: We sequence sensitive items carefully, use shorter recall windows, anchoring, privacy assurances, and self-admin modes where appropriate.
Order, Translation, and Processing Bias
Issue: Question order, language shifts, and inconsistent cleaning choices can distort outcomes.
Control: We use option rotation, back-translation, documented coding rules, dual coding, and reproducible audit-led pipelines.