I-94 Guidance for Visa Waiver Travelers
The Visa Waiver Program, permits nationals of the member countries to enter the U.S. to visit for business or pleasure up to 90 days without having to apply for a visa. Following is a list of the countries covered under this program: Andorra, Australia, Austria, Belgium, Brunei, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Monaco, Netherlands, New Zealand, Norway, Portugal, San Marino, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, and the United Kingdom.
In 2010, U.S. Customs and Border Protection (CBP) began a transition to paperless processing for VWP travelers arriving by air or sea who have obtained a travel authorization via the Electronic System for Travel Authorization (ESTA). Here are the published instructions by the government for using the I-94W for the Visa Waiver travelers.