Click Three Times?
Every now and then, we hear or read the advice that taxonomies should be no more than three levels deep. The reason given is what’s commonly known in the web design world as the three-click rule. Supposedly, users do not have the patience to find information on a website using any more than three clicks of a mouse. Ergo, navigation hierarchies and similar structures are expected to honor this limitation by keeping the entire pool at kiddie depth.