“…It is difficult to compare the expressiveness of the modelling languages used by these tools, as although they all use the same P systems paradigm, they implement different features -some use deterministic execution style [11], whereas many rely on probabilistic or stochastic behaviour [7,28,14,23,68]; SRSim uses strings as opposed to all the others employing multisets; some use explicitly geometric elements [68,14] or a topology of the environment [28], but the others make use only of the membrane structure.…”