To be eligible, the interior must be all-new or significantly redesigned. Factors taken into consideration include aesthetics and design harmony, materials, fit-and-finish, ergonomics, safety, comfort, and value (so nothing above $130k is on the list). The infotainment systems were also evaluated as was the user-friendliness of the "human-machine interface to see how effectively vehicle information is communicated."
Where last year only a trio of luxury models made the top ten list, this year it featured six luxury marques. However, that was primarily a result of so many new luxury models on the market, accounting for 19 of the 47 vehicles tested.