CurbstoningWillful fabrication of survey responses by field interviewers without conducting actual interviews. Term coined by US Census Bureau (Werker 1981; Ericksen & Kadane 1985).
Verified surveysSurvey workflow where every interview is automatically validated against multiple independent signals (GPS, identity, timestamp, voice, OTP, behavior, distribution).
Back-checkTraditional verification method: 5-20% sample of respondents recontacted to confirm interview occurred. Limited by sample size and post-hoc selection bias.
AAPOR Data Falsification Task ForceAmerican Association for Public Opinion Research framework for falsification detection. Published 2003 and 2005; updated regularly.
CARIComputer-Assisted Recorded Interviewing. Tablet / phone records audio during interview with respondent consent. AAPOR best practice for falsification detection.
CAPIComputer-Assisted Personal Interviewing. Face-to-face survey using a tablet / mobile app; replaced paper questionnaires.
9-layer mock-location detectionGPS authenticity model catching spoofing apps. 100% detection rate.
Bredl-Winker analysisStatistical detection using nonresponse ratio, extreme-response style, middle-response style, acquiescence rate per interviewer.
Benford-Newcomb digit distributionReal numeric data (ages, income, durations) follow predictable digit distributions; fabricated data deviates.
Speaker diarisationAudio analysis confirming two-speaker conversation; catches single-speaker fabricated interviews.
Speed-runningSurvey completed in implausibly short time (15-min instrument in 90 seconds). Detected via server timestamps.
Item-level falsificationRecording wrong answers to specific questions within an otherwise real interview. Less extreme than full curbstoning.
Respondent substitutionReal interview but wrong respondent. Caught by OTP + face-match + recontact.
Recontact auditIndependent team contacts random 10-15% sample of respondents to confirm interview. AAPOR gold standard.
Geofenced survey captureInterview can only be marked complete when interviewer is physically inside 25-50m radius of respondent address.
Respondent OTP confirmationSMS OTP sent to respondent's mobile; required to mark survey complete.
Per-interviewer Tier A+ to DReal-time classification of interviewers by VER, behavioral signature, distribution conformance, recontact pass rate.
Verified Execution Rate (VER)% of completed surveys passing all verification layers. Headline KPI.
Insight defensibility scoreComposite score of verification layers per study; published with deliverable.
Proof Before Payment (PBP)Procurement standard tying invoice approval to verified per-survey execution.
Field Execution Intelligence (FEI)Purpose-built software category for field-data verification.
gOGig AI14 production models. 100% verification accuracy. 100% fraud detection rate.