Nationals from the following countries may enter the U.S. without a visa for up to 90 days: Andorra, Austria, Australia, Belgium, Brunei, Denmark, Finland, France, Germany, Iceland, Ireland, Italy, Japan, Liechtenstein, Luxembourg, Monaco, the Netherlands, New Zealand, Norway, Portugal, San Marino, Singapore, Slovenia, Spain, Sweden, Switzerland, and The United Kingdom (citizens with the unrestricted right of permanent abode in England, Scotland, Wales, Northern Ireland, the Channel Islands, and the Isle of Man). The general requirements for participation include no prior overstays in the U.S., and a prepaid round-trip ticket to a non-contiguous country within 90 days of arrival. Aliens entering under the Visa Waiver Program (VWP) are subject to the same rules as those admitted in B-1 or B-2 status - meaning they cannot work!

There are disadvantages to using the VWP program. Aliens cannot extend their stay in the U.S. if they entered on the VWP, nor can they change to another status in the U.S. Accordingly, they must depart the U.S. and re-enter in another work-related nonimmigrant status before working. Moreover, if there are any questions on entry, they MUST return to their originating country on the next flight out, with no ability to resolve those issues at the U.S. Citizenship and Immigration Services (USCIS) district office with jurisdiction or an immigration judge.