ISO 12233 Chart??? HELP???

http://www.the-digital-picture.com/Help/ISO-12233.aspx

Relevant part:

"For the most part, I find the results to be very indicative of the image quality of the lens being tested and the comparisons work very well - the results are even better than I had hoped for. However, I'm not totally satisfied with theCanon EF-S 17-55mm f/2.8 IS USM Lensresults - the 17-55 under-performed in the comparison tool images in my opinion. And the cheapCanon EF-S 18-55mm f/3.5-5.6 IS USM Lensperformed better at the wider focal lengths at the relatively short distance than I would expect to see from this lens - it over-performed in the comparison tool."