![]() ![]() Secondly, besides double-checking their card number after entry, the test subjects were often observed to enter their number in the same format in which it is embossed or printed on their physical card. Several subjects “chunked” the card number into 4-digit groups, rather than entering all 16 digits in one go. The subject would enter 4 digits from his card into the “Card Number” form field, then look down at his credit card for the next 4 digits, enter those, and so on until the entire number had been entered. It’s therefore not that surprising when we during testing observed a sub-group of users meticulously double-checking their card number after having typed it by nearly always looking from the physical card to the typed number on the screen, and using the mouse cursor to inspect the typed number in 4-digit blocks.Īt Walmart, this test subject has begun to enter his credit card number. Indeed our checkout benchmark reveals that even among the 50 top-grossing US e-commerce sites, 18% still clear out the user’s entire card number on just the smallest typo. Many users have – likely due to poor prior general checkout experiences, typically on other sites – come to suspect that a card validation error may also clear out all of their typed card data, hence a transposed digit will force them into re-typing their full credit card data. But in practice it’s often worse than just an error. A single typo when transferring the 15-16 digit numeral string printed on the physical card into the card number form field will cause a validation error. Oftentimes we observed that test subjects, after having inputted their credit card number, double-checked it to make sure the it was correct before submitting the form. Note the placement of the cursor in the card number string.įirstly, during testing, subjects tended to be extra careful when inputting their card number. I just check on the card that the numbers are right… I click between so I can gauge it.” This subject explained her method for checking to make sure that the card number is inputted correctly. ![]() There are two key test observations as to how users behave a) after having typed their card number, and b) when typing their card number. ![]() Why 23% of Users Type or Verify Their Card Number in 4-Digit Blocks
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