"A questionnaire is never perfect: some are simply better than others." A quote of American statistician and quality control pioneer William Edwards Deming (1900-1993). The quote appears on page 31 of Deming's book Some Theory of Sampling (John Wiley & Sons, 1950) . The quote also appears in Statistically Speaking: A dictionary of quotations compiled by Carl Gaither and Alma Cavazos-Gaither.