We investigate three particular instances of the marking cov-erability problem in ordinary, safe Petri nets: the Dead Places Problem, the Dead Transitions Problem, and the Concurrent Places Problem. To address these three problems, which are of practical interest, although not yet supported by mainstream Petri net tools, we propose a combination of static and dynamic algorithms. We implemented these algorithms and applied them to a large collection of 13,000+ Petri nets obtained from realistic systems-including all the safe benchmarks of the Model Checking Contest. Experimental results show that 95% of the problems can be solved in a few minutes using the proposed approaches.
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