Which are the passport requirements in order for one to travel under the Visa Waiver Program?

The conditions to be a part of the visa-free regime are as the following:

• The passport should be an electronic passport with a digital chip that has biometric information about the person who is the holder of the passport;
• It must include an machine-readable area on the biographical page;
• Taiwan passport holders are required to supply an Passport Number and the Personal Identification Number (PIN);
• There is an exception that will take effect July 1st, 2009; Visa Waiver Program countries’ temporary passports as well as emergency passports need to be digital.