Abstract
The paper presents a new approach to model checking of systems specified in UML. All the executions of an UML system (unfolded to a given depth) are encoded directly into a boolean propositional formula, satisfiability of which is checked using a SAT-solver. Contrary to other UML verification tools we do not use any of the existing model checkers as we do not translate UML specifications into an intermediate formalism. The method has been implemented as the (prototype) tool BMC4UML and some experimental results are presented.