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Standardized Survey Interviewing - Minimizing Interviewer Error

A practical, evidence-grounded guide to conducting standardized survey interviews that minimize the measurement error interviewers introduce into survey data.

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What it’s about

Standardized Survey Interviewing distills decades of methodological research into a clear, actionable framework for treating survey interviewing as rigorous scientific measurement rather than art. Fowler and Mangione document precisely how interviewers—through the way they read questions, probe answers, record responses, relate to respondents, and set performance standards—can inflate standard errors, reduce reliability, and bias estimates. Drawing on a large-scale experiment testing interviewer training and supervision plus a rich body of prior research (notably Cannell's work), the authors show which levers actually matter: writing questions that can be asked and answered consistently, training respondents in their role, communicating high accuracy standards, selecting and training interviewers, and—critically—supervising the question-and-answer process via tape recording and monitoring. The book is essential for anyone who collects quantitative data from people, offering cost-effective, empirically justified strategies to produce more valid and precise survey estimates.

The through-line

Who it’s for
A researcher, survey manager, or data collector who wants to produce accurate, valid, precise quantitative descriptions of a population from interview data.
The problem
Interviewers introduce inconsistency and error into survey answers, inflating standard errors and reducing reliability and validity. The researcher feels uncertain whether their data truly measure what they intend, and anxious that human variability undermines their conclusions.
The plan
  1. Design questions that are fully scripted, understood identically, and specify acceptable responses.
  2. Train interviewers in the four standardized techniques with supervised practice.
  3. Have interviewers train respondents and set high accuracy standards.
  4. Select interviewers for reading/writing skills, controlling demographics only when topic-relevant.
  5. Provide two to four days of training including supervised practice.
The payoff
More precise estimates with lower standard errors and less bias. · Reliable, replicable data whose differences reflect real respondent differences. · Interviewers who consistently apply high standards and respondents who understand their role.

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