Self-completed Web surveys offer many advantages, including lower data collection costs, shorter data collection time periods, enhanced survey controls (namely automated skip patterns or forcing responses when applicable), and reduced data entry errors. But the enormous potential of Web surveys must be balanced against an equally large weakness. Most North American households do not have computers or Internet access. In October 1998, only 42 percent of U.S. households reported owning a computer, up from 24 percent in 1994. Another study, conducted by CBC/New York Times in 1998 suggested that two-thirds of all households contacted have access to a computer, and a third of these respondents have Internet access (Dillman 2000, Mail and Internet Surveys). While the proportion of the population with Internet access will continue to increase, the issue of valid coverage is an important consideration when conducting a Web survey.