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There is a certain degree of difficulty in developing and understanding the diagrams used for representing the dynamic behavior of a software application, specified in the Unified Modeling Language (UML). In this paper we evaluate the comprehension of the dynamic modeling in UML designs by using two split-plot factorial experiments. The metrics used for assessing the results are the time spent and the scores obtained in answering a questionnaire. In the first study three factors were controlled: the diagram type (sequence, collaboration and state), the application domain of the UML designs and the order of presentation of the documents. We observe that state diagrams provide higher semantic comprehension of dynamic modeling in UML when the domain is real-time and sequence diagrams are better in the case of a management information application. In the second study two factors were controlled: the …