We noticed a duplicate account was created for one of our donors when the only difference was the e-mail address used. The help desk told us that eTap checks for matches of three parameters: Account name, address, and e-mail. In our case the first two matched, but the new DIY form had a 5+4 digit zip code instead of 5 digits in the existing account. So eTap created a duplicate account.
This is a bad design. People use 5 or 5+4 interchangeably. eTap should only compare the first 5 digits of the ZIP code.
I am now told by the help desk that the duplicate entry was created because the addresses did not match. The existing account had "Ter" for the street name suffix while the new DIY entry used "Terrace". This should also be added to the address compare algorithm in addition to ZIP 5 vs. 5+4.
Here are the common abbreviations that should be considered equivalent:
St = Street
Pl = Place
Ave = Avenue
Blvd = Boulevard
Cir = Circle
Ter = Terrace
Pkwy = Parkway
Rd = Road
La = Lane
For a full list, see: https://printcopymail.umich.edu/mailsvcs/streetsuffixes.htm
also
Ste = Suite
Apt = Apartment = # = Unit
Flr = Floor