UML — Basic concepts and rules

Interval.cz published the second installment of the series Designing Applications 
 in UML. In this installment, René Stein continues to explain basic concepts and
 rules in UML. If you're on the fence about UML or the article itself, at least consider the motto the author gave it.

The article's unwritten motto was an appeal: “Leave behind archaic ways of building applications.” 
This and the following articles are intended for readers who have decided that 
designing with UML will become a fundamental part of their analytical toolkit.