The final sampling frame of 1,433 partners for the 2011 CSS was divided in the same four categories:
1) Importers (515)
2) Carriers (443)
3) Service Providers (267)
4) Foreign Manufacturers (208)
The study shows that support for the program among C-TPAT members is strong however "there is room for improvement". The benefits of the program are hard to quantify.
The full version of the report can be downloaded here.