Excuse me franck, are you blind, or cant you read the very first sentence?

The one that says:

The BOX RULE allows manufacturers to DEVELOP catamarans that are competitively priced yet allowing FREEDOM to builders to DEVELOP HIGHER LEVELS of PERFORMANCE.

I'd say that is a pretty fair bet that having the word develop twice in the first sentence means that is a development class.

I hope you get it now.