This book presents the current methodological knowledge on surveys, for those who want to collect, analyse, or read about survey data with a sound basis for evaluating how each aspect of a survey can affect its precision, accuracy, and credibility. The fourth edition more prominently addresses the growth of Internet use for data collection and the rapid expansion of online survey use; the precipitous drop in response rates for telephone surveys, particularly those based on random-digit dialling; improvements in techniques for pre-survey evaluation of questions; and the growing role of individual cell phones to supplement or replace household landlines. Two new chapters emphasise the importance of minimizing non-sampling errors through superior question design, quality interviewing, and high response rates.