‚Make them, Trade them'
When people first hear about ATCs they are full of questions. They somehow can't believe that the process is so simple - that other than size (2D or 3D) there are no restrictions on subject matter, no criteria for ‚quality', no money involved, and no rules except what you set yourself. The name ATC is a even bit of a misnomer because one definitely doesn't have to be a ‚trained artist' to make cards. You can value your card at whatever you think it's worth: 1 to 1, 1 to 3, whole page for whole page, object for object. You can trade cards on, meaning you don't have to keep the ones you have traded for (called ‚second generation trade'). You don't even have to trade with someone if you don't like their cards. The most important aspects of this concept is to produce a card (exercise your creativity) and then trade it (open communication).
[Cat Schick 2001]