In previous years, Gillis' book gave pretty specific criteria for the ratings in each category. Of course, his criteria may not match yours, so it's important to read the fine print.
For example, in the 2001 guide, one of the categories was Frontal Crash Tests, which only considered the NHTSA frontal crash results. It did not include the side crash results, IIHS offset crash results or rollover ratings. This is somewhat odd, since their section on safety did mention these other tests and include some of those ratings.
For example, in the 2001 guide, one of the categories was Frontal Crash Tests, which only considered the NHTSA frontal crash results. It did not include the side crash results, IIHS offset crash results or rollover ratings. This is somewhat odd, since their section on safety did mention these other tests and include some of those ratings.