LoLA 2 offers a suite of algorithms for verifying place/transition Petri nets. It combines structural with state space methods and general purpose with Petri net-specific techniques. The methods are easily accessible to people with little knowledge of Petri nets since there is a uniform query language based on temporal logic, and the tool takes care of sound application of its methods. Unlike its predecessor LoLA 1, LoLA 2 is based on a strict modularisation and integration of various standard tools. A careful software engineering approach has been used for coding. Through its code quality and its frequent comparison to other tools in the yearly model checking contests, LoLA 2 has become one of the most reliable verification tools for distributed systems.
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