Abstract
Surveys are conducted using many different modes (e.g. face-to-face, mail, telephone, Internet). Because different modes have different error structures, it is very important to understand the advantages and disadvantages associated with each mode. In recent years there have been major changes in the modes typically utilized in surveys. In particular, there has been increases in the use of computers in data collection, self-administration, and mixed-mode designs. The implications of these and future changes are considered.
