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Transaction-based modeling is a widely used graphical method for modeling discrete event systems, a recent implementation being SimEvents from Mathworks. Though it is applicable to a wide range of problems, it has its specific drawbacks. Some of them are connected to the basic abstractions of the method, others are related to the specific program used. By implementing a few different standard examples, we will show some of these shortcomings together with possible workarounds. This should be pointed out, when teaching this method to new users, but additionally has to be taken into account, when building a new transactionbased library or corresponding blockset.

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